1. Solve the system using substitution

x+y=8

y=3x

A. (4,12)

B. (2,6)

C. (1/2,2/3)

D. (-4,-12)

X+y=8

y=3x

You would want to substitute the y for the 3x

x+3x=8

You can now add the x with the 3x to get 4x

4x=8

Now divide the 4 on both side to solve for x

x=2

Now to solve for y just substitute the x for the 2

y=3 (2)

Now multiply the 3 and the 2 to solve for y.

y=6

So your corrct answer is B: (2,6)