Question

resolva os sistema de equaçao

b) {2x+3y=13
x-2y=-5

c) {x+2y=1
3x+7y=2

Answer 1

Ola Karina

2x + 3y = 13
x - 2y = -5

2x + 3y = 13
-2x + 4y = 10

7y = 23
y = 23/7 

x = -5 + 46/7 = -35/7 + 46/7 = 11/7 

S = (11/7, 23/7)


x + 2y = 1
3x + 7y = 2
-3x - 6y = -3
y = -1
x - 2 = 1
x = 3

S  = (3, -1)