EDGE Math 8

Solve each system of linear equations using any of the methods that you learned. Choose your answer.

1.	${\begin{array}{l} x - y = 7 \\ x + y = 13 \end{array}$

(10, 3)

(7, 0)

(3, 10)

no solution

infinitely many solutions

none of the choices

Answer: (10, 3)

2.	${\begin{array}{l} x + 2 y = - 1 \\ - x + y = - 5 \end{array}$

(3, 2)

(−2, 3)

(3, −2)

no solution

infinitely many solutions

none of the choices

Answer: (3, −2)

3.	${\begin{array}{l} 3 x + y = 13 \\ - 3 x + y = - 11 \end{array}$

(4, 1)

(1, 4)

(−1, 4)

no solution

infinitely many solutions

none of the choices

Answer: (4, 1)

4.	${\begin{array}{l} 2 x + y = - 7 \\ - 2 x + 3 y = 3 \end{array}$

(−3, −1)

(−3, 1)

(3, −1)

no solution

infinitely many solutions

none of the choices

Answer: (−3, −1)

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