Subject: Elimination/Substitution
Name: Jennifer
Question:
2x+5y=36 I have to use the Elimination method, as I already know how to do Substitution. How do I begin and show my work? I'm attempting to eliminate the values for y. Hi Jennifer, To eliminate y you need to write two equations that are equivalent to the two that you have, but with the coefficient of y in the two equations the same. That way, if you subtract the two equations, the terms involving y will drop out. For the equations that you have the easiest way to do this is to multiply the first equation by 2 and the second by 5 to get
2(2x+5y) = 2(36) or
4x+10y = 72 Subtracting the first equation from the second leaves 11x = 88 so x = 8. Now substitute x = 8 into either of the two equations that you started with to get the value of y.
Cheers,
