Answer:
The answer is 21
Step-by-step explanation: You substitue 3 for C and 4 for D and craete the equation 
so you add 3+4=7 and you get 
which is 7 times 3 =21
You want to try and get rid of one of the variables ( x or y) so you would multiply the second equation by 2 which would make the x variable -2x which then when added to the first equation would eliminate the x variable.
Answer: c. Multiply the second equation by 2.
Answer:
45 degrees xxxxxxxxxx
Step-by-step explanation:
simple geo
Two at the top (side by side)
Two at the bottom ☝
One on right side
One on left side
And grandfather in the middle
A shape that has four corners and four sides like a square, rectangle, or dimond
