amber0325 amber0325

Today at 4:02 AM
Mathematics

Answered

Solve the following system of equations.
- 2x+7y=9
3x - 4y=-20

Answer :

qumpelka qumpelka

Today at 4:07 AM

Answer:

y = -1

x = -8

Step-by-step explanation:

-2x+7y=9 / *3

3x - 4y=-20 / *2

-6x+21y = 27

6x - 8y = -40

-6x +6x + 21y - 8y = 27 - 40

13y = -13

y = -1

-2x + 7*(-1) = 9

-2x -7 = 9

-2x = 9+7

-2x = 16

-x = 8

x = -8

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