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Monica [59]
3 years ago
14

Solve the system of equations below by graphing both equations with a pencil and paper. What is the solution? y = -x + 21 y = -2

x + 30 A. (8, 12) B. (9, 11) C. (9, 12) D. (8, 11)
Mathematics
2 answers:
irga5000 [103]3 years ago
8 0
C)9,12 that is  the correct answer 

insens350 [35]3 years ago
6 0
C is the answer !!!!!!!
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B

Step-by-step explanation:

All you have to basically do on this one is go backwards.

The beginning equation is 4x+4=12, so to first revesre the adding we are going to use 12, the product, and subtract 4 from it (since that is what was added).

12-4=8

Now you need to reverse the times 4, so to do that just divide instead because that is the invese of multiplication.

8/4=2

Now you have 2, which is the variable, x. To make sure this is right you can just put it into the equation and see if 4x2+4 is 12

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