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Question
Solve the system by substitution.

x=3y
4x-10y=2

Thanks for your help

Answer
Sorry I haven't been able to be here for awhile.

If x = 3y, then put that in for x in the 2nd equation.
That is, 4(3y) - 10y = 2.

Since 4*3 = 12, that is 12y - 10y = 2.
Since 12y - 10y = 2y, we have 2y = 2.

Dividing by 2 gives y = 1.
That means x=3.

Checking the 2nd equation out gives 4*3 - 10 = 12 - 10 = 2, which is what's there.
So, that is correct.

Algebra

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Scott A Wilson

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