SOLUTION: solve by substitution: x-y=4 -5x+3y=6

Question 123307: solve by substitution:
x-y=4
-5x+3y=6
Found 2 solutions by jim_thompson5910, johnnico6426:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given system of equations:

Now in order to solve this system by using substitution, we need to solve (or isolate) one variable. I'm going to solve for y.

So let's isolate y in the first equation

Start with the first equation

Subtract from both sides

Rearrange the equation

Divide both sides by

Break up the fraction

Reduce

---------------------

Since , we can now replace each in the second equation with to solve for

Plug in into the first equation. In other words, replace each with . Notice we've eliminated the variables. So we now have a simple equation with one unknown.

Distribute to

Multiply

Combine like terms on the left side

Add 12 to both sides

Combine like terms on the right side

Divide both sides by -2 to isolate x

Divide

-----------------First Answer------------------------------

So the first part of our answer is:

Since we know that we can plug it into the equation (remember we previously solved for in the first equation).

Start with the equation where was previously isolated.

Plug in

Multiply

Combine like terms

-----------------Second Answer------------------------------

So the second part of our answer is:

-----------------Summary------------------------------

So our answers are:

and

which form the point

Now let's graph the two equations (if you need help with graphing, check out this solver)

From the graph, we can see that the two equations intersect at . This visually verifies our answer.

graph of (red) and (green) and the intersection of the lines (blue circle).

Answer by johnnico6426(16) (Show Source): You can put this solution on YOUR website!
x-y=4
-5x+3y=6
1)The first step is to add y in the equation x-y=4 to both sides.
2)If you do that, you should get x=y+4.
3)You then substitute for x in the second equation -5x+3y=6.
4)If you simplify it, you should end up with -2*y-20=6.
5)Solve for y.
6)Substitue the value of y in the equation x-y=4 to find out the value of x.
Solution:
x=-9
y=-13
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