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- anonymous

Terrible at math, need help with college algebra.

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- anonymous

Terrible at math, need help with college algebra.

- chestercat

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- anonymous

...Which part of college algebra?

- anonymous

The Substitution Method
Solutions to Systems of Linear Equations
Applications of the Substitution Method

- anonymous

Okay, say you have two linear equations that need solving.\[a*x + b*y = c\] and \[d*x+e*y=f.\] Now, you solve one equation for x:\[x = (c-b*y)/d.\] Plug that value for x into your second equation, and solve for a value of y.

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- anonymous

After you have that value of y, you plug it back into either equation, and you'll get the value of x. :)

- amistre64

its really simpler than it looks :)

- anonymous

(Assuming a-f are regular constants.)

- anonymous

So for x-2y=1
3x+12y+15 i am suppossed to find whether the lines are parallel or coinciding...

- anonymous

You mean, 3x+12y = 15?

- amistre64

It depends on what is being asked for in the problem.

- amistre64

oh...that is the problem..thought it was a question lol

- anonymous

yes and i have to write these in slope intercept form

- anonymous

If they coincide, or are the exact same line, then one equation will be the same as the other equation -- just multiplying every term by the same factor.

- amistre64

do you know how to solve each equation for "y"?

- amistre64

x - 2y = 1; how would you solve for "y"?

- anonymous

I amnot sure....

- amistre64

we have to go back to the basics of equations with this; we want to get that "y" all by itself on one side of the equation and everything else to the other side; does that sound familiar?

- amistre64

the basic rule of thumb is: whatever you do to one side, HAS to be done to the other inorder for it to stay equal.

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