8.F.B.4 math practice. Learn by doing.

8.F.B.4 practice covers construct a function to model a linear relationship between two quantities; determine the rate of change and initial value of the function. Work through 8 free questions with answers and explanations, then continue in the related math games.

Grade 84 mapped skills
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8 free questions · 0/0 correct

Practice playeasy

What is the slope of the line y=x−7y = x - 7?

In y=mx+by = mx + b, the slope is m=1m = 1.

Practice playmedium

In the rule g(x)=8x+cg(x) = 8x + c, the value of cc is a constant. Given that g(3)=10g(3) = 10, find g(5)g(5).

Substitute x=3x = 3: 8(3)+c=108(3) + c = 10, so 24+c=1024 + c = 10 and c=−14c = -14. The rule is g(x)=8x−14g(x) = 8x - 14, so g(5)=8(5)−14=40−14=26g(5) = 8(5) - 14 = 40 - 14 = 26.

Practice playeasy

A gym charges a $30\text{\char36}30 monthly membership plus $5\text{\char36}5 for each fitness class. Let xx be the number of classes and yy be the total monthly cost in dollars. Which equation models the situation?

Each class adds $5\text{\char36}5 (slope) on top of the $30\text{\char36}30 membership (intercept), so y=5x+30.y = 5x + 30\textsf{.}

Practice playeasy

What is the slope of the line through (1,2)(1, 2) and (3,8)(3, 8)?

Slope =8−23−1=62=3.= \dfrac{8 - 2}{3 - 1} = \dfrac{6}{2} = 3\textsf{.}

Practice playeasy

What is the yy-intercept of the line y=12x−4y = \dfrac{1}{2}x - 4?

In y=mx+by = mx + b, the yy-intercept is b=−4b = -4.

Practice playmedium

Let p(x)=kx−6p(x) = kx - 6 for some constant kk. If p(2)=10p(2) = 10, what is the value of p(5)p(5)?

Substitute x=2x = 2: 2k−6=102k - 6 = 10, so 2k=162k = 16 and k=8k = 8. The rule is p(x)=8x−6p(x) = 8x - 6, so p(5)=8(5)−6=40−6=34p(5) = 8(5) - 6 = 40 - 6 = 34.

Practice playeasy

An amusement park charges $12\text{\char36}12 for admission and $3\text{\char36}3 for each ride. Let xx be the number of rides and yy be the total cost in dollars. Which equation models the situation?

Admission is the starting cost ($12\text{\char36}12) and each ride adds $3\text{\char36}3, so y=3x+12.y = 3x + 12\textsf{.}

Practice playeasy

What is the slope of the line through (0,5)(0, 5) and (4,−3)(4, -3)?

Slope =−3−54−0=−84=−2.= \dfrac{-3 - 5}{4 - 0} = \dfrac{-8}{4} = -2\textsf{.}

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Practice 8.F.B.4 inside a game.

The placement test chooses the right difficulty while every match keeps the standard in play.