SOLUTION: Solve using the substitution method y = 2x - 5 3x + y = 15

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Question 170331This question is from textbook Introductory Algebra
: Solve using the substitution method
y = 2x - 5
3x + y = 15 This question is from textbook Introductory Algebra

Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
Since you are already given what y equals, we will plug that into the second equation to find x;
y = 2x - 5
3x + y = 15
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3x + (2x - 5) = 15
5x - 5 = 15
5x = 20
x = 4
Now we have x, lets plug that into the equation to find y;
3(4) + y =15
12 + y =15
y = 15-12
y = 3
:)