Question

qual o resultado do sistema x-2y=3//2x+y=11

Answer 1

x - 2y = 3     -----> x = 3 + 2y
2x + y = 11
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2 * (3 + 2y) + y = 11
6 + 4y + y = 11
5y = 11-6
5y = 5
y = 5 / 5 
 y = 1

x = 3 + 2y
x = 3 + 2*1
x= 3 + 3
x = 6