Answer:
C = - 21 -6x
Step-by-step explanation:
6x + 12y = 15 (1)
- 6 + 2y = C (2)
multiply equation (2) by 6
- 36 + 12y = C (3)
subtract equation (1) from equation (3)
- 36 + 12y = C
6x + 12y = 15
___________
- 36 - 6x = C - 15
now we collect the terms (make C by itself)
- 36 + 15 - 6x = C (to do this we add 15 to both sides)
- 21 -6x = C
That's about as much as you can simplify it.
Hope this helps,
Cate
