Product systems that compare numbers. Game on.

Product systems that compare numbers is a grade 9 math skill aligned to Common Core standard HSA.REI.C.6: solve systems of linear equations exactly and approximately, focusing on pairs of linear equations in two variables. Below are 8 practice questions with answers and step-by-step explanations, drawn from the 10 product systems that compare numbers problems our math games drill.

CCSS HSA.REI.C.610 questions in the bank
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Warm-upmedium

The product of two positive integers is 260260. If the first integer is 66 greater than twice the second integer, what is the smaller of the two integers?

Let xx be the first integer and yy the second. Then xy=260xy = 260 and x=2y+6x = 2y + 6. From the product, y=260xy = \dfrac{260}{x}. Substitute into the second equation: x=2(260x)+6x = 2\left(\dfrac{260}{x}\right) + 6. Multiply through by xx to clear the denominator: x2=520+6xx^{2} = 520 + 6x. Rearrange: x26x520=0x^{2} - 6x - 520 = 0. Factor: (x26)(x+20)=0(x - 26)(x + 20) = 0. The positive solution is x=26x = 26, so y=26026=10y = \dfrac{260}{26} = 10. The smaller integer is 10.10\textsf{.}

Mid-gamemedium

The product of two positive integers is 156156. If the first integer is 22 greater than 44 times the second integer, what is the smaller of the two integers?

Let xx be the first integer and yy the second. Then xy=156xy = 156 and x=4y+2x = 4y + 2. From the product, y=156xy = \dfrac{156}{x}. Substitute into the second equation: x=4(156x)+2x = 4\left(\dfrac{156}{x}\right) + 2. Multiply through by xx to clear the denominator: x2=624+2xx^{2} = 624 + 2x. Rearrange: x22x624=0x^{2} - 2x - 624 = 0. Factor: (x26)(x+24)=0(x - 26)(x + 24) = 0. The positive solution is x=26x = 26, so y=15626=6y = \dfrac{156}{26} = 6. The smaller integer is 6.6\textsf{.}

Mid-gamemedium

The product of two positive integers is 324324. If the first integer is 33 greater than twice the second integer, what is the smaller of the two integers?

Let xx be the first integer and yy the second. Then xy=324xy = 324 and x=2y+3x = 2y + 3. From the product, y=324xy = \dfrac{324}{x}. Substitute into the second equation: x=2(324x)+3x = 2\left(\dfrac{324}{x}\right) + 3. Multiply through by xx to clear the denominator: x2=648+3xx^{2} = 648 + 3x. Rearrange: x23x648=0x^{2} - 3x - 648 = 0. Factor: (x27)(x+24)=0(x - 27)(x + 24) = 0. The positive solution is x=27x = 27, so y=32427=12y = \dfrac{324}{27} = 12. The smaller integer is 12.12\textsf{.}

Mid-gamemedium

The product of two positive integers is 288288. If the first integer is 55 greater than 33 times the second integer, what is the larger of the two integers?

Let xx be the first integer and yy the second. Then xy=288xy = 288 and x=3y+5x = 3y + 5. From the product, y=288xy = \dfrac{288}{x}. Substitute into the second equation: x=3(288x)+5x = 3\left(\dfrac{288}{x}\right) + 5. Multiply through by xx to clear the denominator: x2=864+5xx^{2} = 864 + 5x. Rearrange: x25x864=0x^{2} - 5x - 864 = 0. Factor: (x32)(x+27)=0(x - 32)(x + 27) = 0. The positive solution is x=32x = 32, so y=28832=9y = \dfrac{288}{32} = 9. The larger integer is 32.32\textsf{.}

Mid-gamemedium

The product of two positive integers is 266266. If the first integer is 33 greater than 55 times the second integer, what is the smaller of the two integers?

Let xx be the first integer and yy the second. Then xy=266xy = 266 and x=5y+3x = 5y + 3. From the product, y=266xy = \dfrac{266}{x}. Substitute into the second equation: x=5(266x)+3x = 5\left(\dfrac{266}{x}\right) + 3. Multiply through by xx to clear the denominator: x2=1330+3xx^{2} = 1330 + 3x. Rearrange: x23x1330=0x^{2} - 3x - 1330 = 0. Factor: (x38)(x+35)=0(x - 38)(x + 35) = 0. The positive solution is x=38x = 38, so y=26638=7y = \dfrac{266}{38} = 7. The smaller integer is 7.7\textsf{.}

Mid-gamemedium

The product of two positive integers is 510510. If the first integer is 44 greater than twice the second integer, what is the smaller of the two integers?

Let xx be the first integer and yy the second. Then xy=510xy = 510 and x=2y+4x = 2y + 4. From the product, y=510xy = \dfrac{510}{x}. Substitute into the second equation: x=2(510x)+4x = 2\left(\dfrac{510}{x}\right) + 4. Multiply through by xx to clear the denominator: x2=1020+4xx^{2} = 1020 + 4x. Rearrange: x24x1020=0x^{2} - 4x - 1020 = 0. Factor: (x34)(x+30)=0(x - 34)(x + 30) = 0. The positive solution is x=34x = 34, so y=51034=15y = \dfrac{510}{34} = 15. The smaller integer is 15.15\textsf{.}

Mid-gamemedium

The product of two positive integers is 385385. If the first integer is 22 greater than 33 times the second integer, what is the larger of the two integers?

Let xx be the first integer and yy the second. Then xy=385xy = 385 and x=3y+2x = 3y + 2. From the product, y=385xy = \dfrac{385}{x}. Substitute into the second equation: x=3(385x)+2x = 3\left(\dfrac{385}{x}\right) + 2. Multiply through by xx to clear the denominator: x2=1155+2xx^{2} = 1155 + 2x. Rearrange: x22x1155=0x^{2} - 2x - 1155 = 0. Factor: (x35)(x+33)=0(x - 35)(x + 33) = 0. The positive solution is x=35x = 35, so y=38535=11y = \dfrac{385}{35} = 11. The larger integer is 35.35\textsf{.}

Buzzer beatermedium

The product of two positive integers is 130130. If the first integer is 66 greater than 44 times the second integer, what is the smaller of the two integers?

Let xx be the first integer and yy the second. Then xy=130xy = 130 and x=4y+6x = 4y + 6. From the product, y=130xy = \dfrac{130}{x}. Substitute into the second equation: x=4(130x)+6x = 4\left(\dfrac{130}{x}\right) + 6. Multiply through by xx to clear the denominator: x2=520+6xx^{2} = 520 + 6x. Rearrange: x26x520=0x^{2} - 6x - 520 = 0. Factor: (x26)(x+20)=0(x - 26)(x + 20) = 0. The positive solution is x=26x = 26, so y=13026=5y = \dfrac{130}{26} = 5. The smaller integer is 5.5\textsf{.}

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