Question

Resolva os sistemas lineares:

A) x+y=3
2x-3y=-4


B) 5x-3y=1
4x+7y=5

Answer 1

A)
x + y = 3 > x = 3 - y
2(3 - y) - 3y = -4
6 -2y -3y = -4
-5y = -10
y = 2 > x = 3 - y > x = 3 - 2 > x = 1