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How do you solve y equals 2x plus 15 and y equals 4x plus 7 using substitution?
Wiki User
∙ 12y ago
y = 2x + 15
y = 4x + 7
Substitute the value of y from the first equation into the second:
2x + 15 = 4x + 7
Subtract 2x from both sides: 15 = 2x + 7
Subtract 7 from both sides: 8 = 2x
Divide both sides by 2: 4 = x.
Replace x by its value, 4, in the first equation:
y = 2*4 + 15 = 8 + 15 = 23
So the solution is (x, y) = (4, 23)
Wiki User
∙ 12y ago
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