Question

por favor me ajudem. ​

Answer 1

a) x + y = 42

x - y = 8

________

2x + 0 = 50

x = 50 / 2

x = 25

b) 2x + 7y = 1

-2x + 3y = -11

___________

0 + 10y = - 10

y = -10/10

y = -1

c) 7x - 4y = 22. 7x - 4y = 22

2x - 4y = - 8 .(-1) >>> -2x +4y = 8

_________

5x +0 = 30

x = 30 /5

x = 6

d) 8x + 6y = 10. 8x + 6y = 10

-3x +6y = -12 .(-1) >>> +3x -6y = 12

_________

11x +0 = 22

x = 22/11

x = 2

e) 4x + 2y = -7 . (+3) 12x +6y = -21

2x +3y = 0,5 . (-2) >>> -4x -6y = -1

__________

8x + 0 = -22

x = -22/8 = -11/4