2 years ago

Please provide steps. I have a test soon.

Mathematics

1 answer:

marishachu [46]2 years ago

6 0

Answer:

B) 5x+15y=30

5x-5y=10

Step-by-step explanation:

First, we solve the top equations by addition. Multiply the first one by -4.

-4x-12y=-24

4x-8y=4

This equals -20y=-20, so y=1. Now we put that back into either equation and find that x=3. So the solution set is (3,1)

Plugging those into each of the possible choices, we find that the answer is

B) 5x+15y=30. 5(3)+15(1)=30 15+15=30. 30=30 CHECK

5x-5y=10 5(3)-5(1)=10. 15-5=10. 10=10. CHECK

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