Answer: x=-2 y=8
Explanation:
multipying 2x+5y=36 by 3
multipying 3x+12y=90 by -2
6x+15=108
-6x-24y=-180
sum the equations
-9y=-72
y=8
put y in one of the equations and find x
2x+5y=36
2x+5*8=36
2x+40=36
2x=36-40
2x=-4
x=-2
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