janayplacencia9 janayplacencia9

07-05-2019
Mathematics

contestada

Solve the system of equations using addition.
4x –y = –6
5x + y = –21

What is the solution of the system?

A. (3,6)
B. (6,3)
C. (–6,–3)
D. (–3,–6)

Respuesta :

07-05-2019

4x - y = -6 ....(1)

5x + y = -21 ....(2)

(1) + (2)

9x = -27

x = -3

from (1)

4 * -3 - y = -6

we solve

y = -6

so the answer is

D ( - 3 , - 6 )

Answer Link

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