I'm take grade 10 academic math and we just started the substitution method. My question is, If you have a problem for ex.
y=x-1
y=2x-3
and for the first step your suppose to Isolate one variable. My teacher says to take the first one that's isolated to start with. But in this problem there is 2 already isolated, y and x. The point where i got stuck is here:
y=x-1
y=2x-3
y=(x-1)
y=2x-3
(x-1)y=2x-3
Now i don't know how to do the rest of the steps. I'm stuck and i need your help. Thanks a lot math central:)
From, Kayla
Hi Kayla,
You have the two equations
y = x - 1
y = 2x - 3
and you have correctly recognized that the first equation already has y isolated. The method is then to replace y in the second equation by this value. That is, in the second equation, every place you see y, substitute x - 1. The second equation then becomes
x - 1 = 2x - 3
Does this help? Let me know if you still have difficulty finishing this problem.
Harley