Rearranging the first to isolate :
Now attempt to substitute this into the second equation. If you can't, then please show your working.
Hey Everyone! I'm going to have a few emergency help questions today and early tomorrow. I have a huge test.
My problem right now is solving with substitution, and I am given the following problem to do so with:
4x+y=5
2x-3y=13
I'm thinking I should bring up the 2x or the 3 from the bottom equation to the top? T
Thanks!
Hello, annon25!
Solve by substitution: .
I'm thinking I should bring up the 2x or the 3 from the bottom equation to the top?
What does that mean?
Do you understand the substitution method?
[1] Solve one of the equations for one of its variables.
[2] Substitute this into the other equation and solve for the remaining variable.
[3] Then solve for the other variable.
Solve [1] for
Substitute into [2]: .
. . . . and we have: .
Substitute into [1]: .
Therefore: .
Since the questions states substitution I would not use pickslide's methods (which is elimination). What it wants you to do is sub an expression for either x or y into the other equation solving for one of the variables then finding the other.
In your case it is easier to subtract 4x from both sides to get . You can now sub 5-4x for y in the second equation: .
You can now find x and then use the first equation to find y