Question

What point below is the solution to the expression 2x+y=12

A) (4,2) C) (8,-1)
B) (3,6) D) (0,6)

Answer 1

Explanation:

It's B.

Let's rewrite the expression like this :

2x+y=12 ⇒ y=12-2x

and try given values for x :

1. if x=4 ⇒ y=12-(2×4)=12-8=4 ( so it is not 2 ) ⇒ wrong
2. if x=3 ⇒ y=12-(2×3)=12-6=6 (it is 6) ⇒ right
3. if x=8 ⇒ y=12-(2×8)=12-16=-4 (so it is not -1) ⇒ wrong
4. if x=0 ⇒ y=12-(2×0)=12-0=12 (so it is not 6) ⇒ wrong

Answer 2

The answer is B. If you substitute 3 for x and 6 for y, you get 2(3)+(6)=12, and that simplifies to 6+6=12, which then adds up to 12=12. Hope this helps!