Question

CHECK MY HOMEWORK PROBLEM PLEASE.

3C - 6D = 12
7C + 5D = 9

7(3C - 6D = 12)= 7(12)
3 (7C + 5D = 9)= 3(9)

21C - 42D = 84
21C - 15D = 27

21C - 42D = 84
-21C - 15D = -27

21C - 42D = 84
-21C - 15D = -27
_________________
57D = 57
D = 57/-57= -1

3C - 6D = 12
3C - 6(-1)= 12
3C + 6 = 12
3C = 12 - 6
3C = 6
C = 6/3 = 2

Answer 1

check your answers:
3(2)-6(-1)=12?
6+6=12? true
7c+5d=9?
7(2)+5(-1)=9?
14-5=9? true
your answers are good

Answer 2

@JohannaG You have done a great work.
Thanks @Dockworker for explaining how to check the answers for correctness.:)

Answer 3

yw

Answer 4

Thank you guys:-)