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You are here: Experts > Science > Math for Kids > Basic Math > Subitution Math Problem
Basic Math - Subitution Math Problem
Expert: Lynn Houston - 11/6/2009
Question
What are the steps to this substitution
y=9x-28
8x-3y=27
Answer
You take the value of y, which is 9x-28 and you fill that into the second equation for y.
8x - 3(9x-28) = 27 Do the multiplication
8x - 27x + 84 = 27 add like terms
-19x + 84 = 27 subtract 84 from both sides of the equation
-19x = -57 divide both sides by -19
x = 3 now you do the same thing with the value of x, fill it into the first eq
y = 9(3) - 28
y = 27 - 28
y = -1
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