Question 1050023
.
y=3x-5       y=-2x-15
how to use the substitution method on these equations.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


<pre>
You have two equations

y =  3x -  5,    (1)
y = -2x - 15.    (2)

You just have "y" expressed via "x" in the equation (1): y 3x-5.
Simply substitute it instead of "y" into the second equation. You will get

3x - 5 = -2x -15.   (3)

Now you have a single equation for one unknown "x" only.

Simplify and solve it.



I can express this procedure in other words.

Sinse the left sides of the equations (1) and (2) are identical, their right sides are equal:

3x - 5 = -2x -15.   (4)

You get the sane equation as (3).

Now simplify and solve it.
</pre>