How do you combine the system of equations #7x - 9y = 2# and #7x + 3y = - 10#?
2 Answers
Explanation:
Given :
Add equations (1), (2). We get
Rearranging like terms together,
Similarly,
But L H S = R H S.
Explanation:
The primary idea of combining a system of equations is that one term cancels out, leaving a single one-variable equation. For example, in this case, you can easily see that both equations have a
From here, divide by -12:
If you want to find the solution to the ordered pair, then substitute the y into one of the original equations.
Note: this could also work if you wanted to cancel out the