3. Solve the system using substitution.

y=8-x

7=2-y

A. (5,13)

B. (13,-5)

C. (3,5)

D. (21,-13)

Y=8-x

7=2-y

First substitute the y in the second problum for 8-x

7=2-8+x

Now subtract the 8 and the 2

7=-6+x

add the - 6 on both sides to solve for x

13=x

Now substitute the x for the 13 into the first problum

y=8-13

Subtract the 13 and 8 to solve for y

y=-5

Your answer

y=-5

x=13

so your correct answer would be

B: (13,-5)