Explanation:
x + 2y = 8 , x= -5
-5 + 2y = 8
add 5 to both sides:
-5 + 2y + 5 = 8 + 5
2y = 8 + 5
2y = 13
divide both sides by 2:
2y/2 = 13/2
y = 13/2 or 6.5
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