Grade 9 · Algebra & functions

Inconsistent linear systems practice

Inconsistent linear systems 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 20 inconsistent linear systems problems our math games drill.

CCSS HSA.REI.C.620 questions in the bank
Sample questions

Try 8 for free

Question 1easy

Which of the following systems of linear equations has no solution?

Both equations have slope 22 but different yy-intercepts (33 and 1-1), so the lines are parallel and the system has no solution.

Question 2easy

Which system of linear equations has no solution?

Both equations have slope 3-3 but different yy-intercepts (22 and 55), so the lines are parallel and the system has no solution.

Question 3easy

Which of the following systems has no solution?

Both equations have slope 44 but different yy-intercepts (1-1 and 33), so the lines are parallel and the system has no solution.

Question 4easy

Which system below has no solution?

Both equations have slope 1-1 but different yy-intercepts (66 and 2-2), so the lines are parallel and the system has no solution.

Question 5easy

Which system of equations has no solution?

Both equations have slope 66 but different yy-intercepts (11 and 4-4), so the lines are parallel and the system has no solution.

Question 6easy

5x+2y=6+y5x + 2y = 6 + y and 10x+my=1110x + my = 11. In the given system of equations, mm is a constant. If the system has no solution, what is the value of mm?

Combine like terms in the first equation: 5x+y=65x + y = 6. Matching the xx- and yy-coefficient ratios with the second equation gives m=2m = 2, so the lines are parallel. Multiplying the first equation by 22 would require 1212 on the right of the second equation, not 1111, so the lines have different intercepts and there is no solution.

Question 7easy

9x2y=4y+19x - 2y = 4y + 1 and 3xky=53x - ky = 5. In the given system of equations, kk is a constant. If the system has no solution, what is the value of kk?

Combine like terms in the first equation: 9x6y=19x - 6y = 1. Matching the xx- and yy-coefficient ratios with the second equation gives k=2k = 2, so the lines are parallel. Multiplying the first equation by 13\dfrac{1}{3} would require 13\dfrac{1}{3} on the right of the second equation, not 55, so the lines have different intercepts and there is no solution.

Question 8medium

Which of these linear systems has no solution?

The first equation gives y=2x+5y = -2x + 5. The second simplifies to y=2x+6y = -2x + 6, so the slopes match but the intercepts differ and the system has no solution.

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