Substitution and combination methods.?

Question

ok so i have 2 questions on a review packet and i start school tomorrow and i allready have a test! i havent taken algebra in two years and i really need need some help.

can someone please explain to me step by step how to solve these two problems

Substitution

y=3x-5

y=4x

and linear combinations:

4x-2y=-2

x+2y=-3

thanks.

Answer 1

Substitution

y=3x-5

y=4x

Since y = 4x, you can replace the y in the first equation:

y=3x-5

4x = 3x - 5

Now solve for x.

Once you have x, use the second equation to find y.

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and linear combinations:

4x-2y=-2

x+2y=-3

I think they mean to combine the equations.  Here is you add them together the y goes away and you get:

5x = -5

Now solve for x.  Then use that in one of the equations to find y.