Question

Solve the following system.

y = x + 3
4x + y = 18

(6, 3)

(3, 6)

(-3, 6)

(3, -6)

Answer 1

y = x + 3
4x + y = 18

Our first equation tells us what 'y' equals...so we can just plug that into the second equation for 'y'

4x + y = 18 becomes

4x + x + 3 = 18

Now simplify

4x + x + 3 = 18
-3 -3
-----------------
4x + x = 15

5x = 15
--------
5 5

x = 3

So if your 'x' = 3...what does 'y' equal?

Answer 2

6 ?

Answer 3

Correct :)