Question

x + y = 4 2x + y = 7 ????? Socorro ​

Answer 1

sistema de equacao
x+y= 4
2x+y=7

x=4-y
2(4-y) +y= 7
8-2y+y=7
8-7=2y-y
1=y
se x+y= 4 e y= 1 entao x sera x+1=4, x=4-1,
x=3