SOLUTION: Using substitution. X=3y 3x-5y=12

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Question 694896: Using substitution.
X=3y
3x-5y=12
Answer by Simnepi(216) About Me  (Show Source):
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x = 3y this is equation 1
3x - 5y = 12 this is equation 2
so putting equation 1 into equation 2 gives
3 X 3y - 5y = 12
simplifying gives
9y - 5y = 12
so
4y = 12
therefore
y = 3
substitute this into equation 1
x = 3 X 3
so
x = 9