Question

The Value of x in the system of equation at the right is -2 what is the value of a? use elimination to help you find the value. ax + 4y = 6
2x - 4y = -16

Answer 1

2x-4y=-16
ax+4y=6      +
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2x+ax=-10;     for x=-2, 
2(-2)+a(-2)=-10
-2a=-10+4
a=-6/-2
a=3