Question

metodo da substituiçao de
x-5y=15
2x-y=19

Answer 1

x-5y = 15
x= 15+5y

2x-y = 19
2(15+5y) - y = 19
30 + 10y -y = 19
30+9y= 19
9y= 19-30
9y= 11
y= 11/9

x= 15+5y
x= 15+5(11/9)
x= 15 + 55/9
x= 135/9 + 55/9
x= 190/9