Question

Determine o ponto de intersecção x+y-4=0 e 2x-3y-3=0

Answer 1

x+y -4 = 0
y = -x+4

2x-3y-3 = 0
-3y = -2x+3 .(-1)
3y = 2x-3
y = (2x-3)/3

(2x-3)/3 = -x-4
2x-3 = 3.(-x-4)
2x-3 = -3x+12
2x+3x = 12+3
5x = 15
x = 15/5
x = 3

3+y-4 = 0
y = 4-3
y = 1

P = (3; 1)