Question

Solve the system by Substitution.

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

Answer 1

x=6 y=-1

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