y=x-2 using subsutition

Question

what is the answer by using the aubstitution method?

Answer 1

Usually there are the same number of equations as there are unknowns, Savannah, unless the problem asks you to solve for one of the unknowns with respect to the other.  For instance, in the problem you listed, you have the value of y with respect to x; perhaps they want you to solve for x?  If so, the answer would be x=y+2.  On the other hand, if there is a second equation, the value of y could be substituted in that second equation to solve for x.  For instance, if the second equation happened to be 2y +x = 5, then substituting x-2 for y would yield the following: 2(x-2)+x=5, 2x-4+x=5, 3x-4=5, 3x=9, x=3.  I hope this made sense to you.

Amy Crookes