How do you solve this system of equations: #4x - 3y = 39 and 3x + y = 39#?
3 Answers
See a solution process below:
Explanation:
Step 1) Solve the second equation for
Step 2) Substitute
Step 3) Substitute
The Solution Is:
Explanation:
Let's start by solving for a single variable.
Now let's substitute
Now that we have
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Now let's double check our math here:
We say that
We were right!
Another way we could have checked that is graphed the two functions and see where they intercepted, which is at the point
So either way, we can see that we are correct! Nice work
Here's how I did it!
Explanation:
First you want to pick one of your two equations and a variable you want to isolate in it. I'm going to pick
Perfect! Now we have a value for
Great! Now that we have a numerical value for
There we go!