4x - 5y = 7 dan x + 3y + 1 = 0 metode substitusi

x=-1-3y
4(-1-3y)-5y=7
-4-12y-5y=7
-17y=7+4
-17y=11
y=-11/17

x=-1-3(-11/17)
=-1+(33/17)
=(-17/17)+(33/17)
=16/17