Question

Resolva cada equação para x= y-3 e encontre o valor de y. a) x+2y=7 b) 2x-y= -8

Answer 1

y-3 +2y = 7
3y = 10
y = 10/3
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2(y-3) - y = -8
2y-6 -y = -8
y = - 2

Answer 2

a) y-3+2y=7
3y=10
y=10/3


b) 2.(y-3)-y=8
2y-6-y=8
y=14