Question

{x-5y=0 {7x-20y=45 qual a resposta ? ajude por favor

Answer 1

{x-5y=0
{7x-20y=45
x=0+5y
7(0+5y)-20y=45
0+35y-20y=45
15y=45
y=45/15
y=3
x=0+5y
x=0+5.3
x=0+15
x=15
S={(15, 3)}