Question

a-(5x+3y=19
(2x+2y=10

b-(4x +Y=21
(2x+2y=12​

Answer 1

Explicação passo-a-passo:

a)5x+3y=19. (-2)

2x+2y=10. (5)

-10x-6y=-38

10x+10=50

4y=12

y=12/4

y=3

5x+3.3=19

5x+9=19

5x=19-9

5x=10

x=10/5

x=2

b)4x+y=21. (-2)

2x+2y=12. (4)

-8x-2y=-42

8x+8y=48

6y=6

y=6/6

y=1

4x+1=21

4x=21-1

4x=20

x=20/4

x=4