Question

na equação 2x-y=7,sendo y=-1 o valor de x e: a)4 b)-9 c)3 d)-5

Answer 1

2x+1=7
2x=7-1
x=6/2
x=3

Answer 2

2x-(-1)= 7
2x+1= 7
2x= 7-1
2x= 6
x= $\frac{6}{2}$
x = 3