Question

sistema equacional método de substituição x+7y=13 / 5x+y=31

Answer 1

x=13-7y

5 . (13-7y) +y=31
65-35y+y-31=0
-34y+34=0 . (-1)
34y-34
34y= 34
y=34/34
y=1


x=13-7y
x=13-7. 1
x=13-7
x=6

Answer 2

x+7y=13 x=13-7y 5(13-7y)+y=31 65-35y+y=31 -34y=31-65 y=-34/-34 y=1 x=13-7.1 x=13-7=6