threeee threeee

10-09-2020
Mathematics

contestada

7x - 4y = -30
3x + 4y = 10
Solve by elimination

Respuesta :

Аноним Аноним

12-09-2020

Answer:

x = - 2

y = 4

Step-by-step explanation:

7x - 4y = -30

3x + 4y = 10

add

7x + 3x - 4y + 4y = - 30 + 10

10x = - 20

x = - 20 : 10

x = - 10

replace x

3(-2) + 4y = 10

- 6 + 4y = 10

4y = 10 + 6

4y = 16

y = 16 : 4

y = 4

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