Question

2x + 3y = 7
3x - 5y = 1

Resposta = ????????

Answer 1

{2x + 3y = 7 *(-3)
{3x - 5y = 1 *(2)
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-6x - 9y = - 21
6x - 10y = 2
‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
-19y = - 19
y = -19/-19
y = 1

2x + 3y = 7 sendo y = 1
2x + 3.1 = 7
2x = 7 - 3
x = 4/2
x = 2

R.: S = {2,1}