Question

determine o conjunto verdade da equação: -9+3y-1=y+7

Answer 1

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$-9+3y-1=y+7 \\ \\ 3y-y=7+9+1 \\ \\ 2y=17 \\ \\ y= \frac{17}{2} \\ \\ \\ V=\{ \frac{17}{2} \}$

Answer 2

-9+3y-1=y+7
3y-y=7+9+1
2y=17
y=17/2
y=8,5
s=(8,5)