Question

Respondam pra mim pfv

Answer 1

Explicação passo-a-passo:

{ x + y = 7

{ x - y = 1

________

2x = 8

x = 8÷2

x = 4

X + Y = 7

4 + y = 7

y = 7 - 4

y = 3

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{3x +2y = 1

{5x - 2y = 18

___________

8x = 19

X = 19/8

x = 2,425

3x + 2y = 1

3 . 2,425 + 2y = 1

2y = 1 - 7,275

y = - 7,275 / 2

y = 3,6375