SOLUTION: Solve by substitution x=2y y=2x+3 Check answer

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Question 470476: Solve by substitution x=2y
y=2x+3 Check answer
Answer by MathLover1(20849) About Me  (Show Source):
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Solve by substitution
x=2y......1

y=2x%2B3....2
----------------------substitute x with 2y in 2
y=2%2A2y%2B3....2.solve for y
y=4y%2B3
-3=4y-y
-3=3y
-3%2F3=y
-1=y..now find x
x=2y......1
x=2%28-1%29
x=-2
check:
y=2x%2B3....2
-1=2%28-2%29%2B3
-1=-4%2B3
-1=-1