Question

a intersecção das retas 5x+4y+2=0 e 2x-y-7=0

Answer 1

{2x-y-7=0 ======> y = 2x-7

{5x+4y +2=0
5x +4(2x-7) +2 = 0
5x +8x-28 +2 = 0
13x -26 = 0
13x = 26
x = 26/13
x= 2 ==========> y=2(2)-7= 4-7 = -3

==>P: ( 2, -3 ) ✓