SOLUTION: Please help me solve this equation by method of substitution y=x(3) I tried substituting 14 for x. The main equation is x + y = 56 where y =x(3). After the substitution I got 14 +

Algebra ->  Inequalities -> SOLUTION: Please help me solve this equation by method of substitution y=x(3) I tried substituting 14 for x. The main equation is x + y = 56 where y =x(3). After the substitution I got 14 +       Log On


   

Question 347672: Please help me solve this equation by method of substitution y=x(3) I tried substituting 14 for x. The main equation is x + y = 56 where y =x(3). After the substitution I got 14 + 42 = 56 and 42=14(3). Is that correct?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
No, that's not correct.
How did you come up with 14?
.
.
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1.y=3x
2.x%2By=56
Now substitute eq. 1 into eq. 2, that's where the substitution comes in.
x%2B%283x%29=56
4x=56
x=14
That's where the 14 comes from.
Now use either equation and the result for x to find y.
From eq. 1,
y=3%2814%29
y=42
So the solution is x=14 and y=42.
You verify the solution by plugging it back into your original equations.