Question

B)x+y=170 x-y=20x(+5​

Answer 1

Método: Sustitución

{x + y = 170

{x - y = 20 × 5

{x + y = 170

{x - y = 100

{x + y = 170

{x = 100 + y

100 + y + y = 170

100 + 2y = 170

2y = 170 - 100

2y = 70

y = 35

x = 100 + 35

x = 135

(x, y) = (135, 35)

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