Question

solve the following system of equations. Enter the y coordinate of the solution. round your answer to the nearest tenth
5x+2y=21
-2x+6y=-31

Answer 1

5x + 2y = 21 ....multiply by 2
-2x + 6y = -31...multiply by 5
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10x + 4y = 42 (result of multiplying by 2)
-10x + 30y = - 155 (result of multiplying by 5)
--------------add
34y = - 113
y = -113/34 = - 3.3 <==