Question

Part 1: Explain, in complete sentences, how you would use the substitution method to solve the following system of equations.

Part 2: Provide the solution to the system.

2x – y = 5
x + 2y = 15

Answer 1

multiply first with 2 and subtract second from first

Answer 2

4x-2y=10
x +2y =15
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3x 0 = -5
x= -5/3

-5/3 +2y =15
-5+6y=45
6y=50
y=50/6
y=25/3