asimpson832097 asimpson832097

29-10-2020
Mathematics

contestada

Solve the system by Substitution.
x−y=7
−2x+7y=−19
A. No Solution
B. (6, -1)
C. (7, 6)
D. (6, 5)

Respuesta :

29-10-2020

Answer:

x=6 y=-1

Step-by-step explanation:

x=7+y

-2(7+y)+7y=-19

x=7+y

-14+5y=-19

x=7+y

5y=-5 ===> y=-1

x=7-1

y=-1

x=6

y=-1

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