Question

encontre o x-y em: {2x+y=5
{3x-y=10

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Answer 1

{2x + y = 5 }
{3x - y = 10}
2x + 3x =5x
+ y - y = 0
5 + 10 = 15
5x = 15
15 ÷5 = 3 x = 3
2×3 + y = 5
6 + y = 5
y = 5 - 6 y = - 1
x = 3 y = - 1