Hi Justin;
Y=4x
X+y=10
In the second equation, the x and y are on the left side.
Let's orient the first equation the same way...
y=4x
Let's subtract 4x from both sides...
4x+y=0
(x+y=10)
5x+0=10
We are subtracting the second equation from the first...
5x=10
x=2
Let's plug this into either equation to solve for y. I randomly select the first equation...
y=4x
y=(4)(2)
y=8
Let's verify by plugging both results into the second equation...
x+y=10
2+8=10
10=10
1/22/2014

Vivian L.
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