Can anyone find out what x and y is to this problem? Using the method: Substitution.?
2.5y + 3y =21
Thanks

Question

Can anyone find out what x and y is to this problem? Using the method: Substitution.?
2.5y + 3y =21 
Thanks

texaschic101 · Answer

what ? There is not even an x in the equation. Please check your question again and see if you wrote it wrong.

anonymous · Answer

I ment to put down 3x not y
so it would be 2.5y + 3x = 21

anonymous · Answer

Does that still not make sense? :o

texaschic101 · Answer

2.5y + 3x = 21
3x = 21 - 2.5y
x = (21 - 2.5y)/3

now sub (21 - 2.5y)/3 in for x
2.5y + 3(21 - 2.5y)/3 = 21
2.5y + 21 - 2.5y = 21
0 = 0 so x = 0

now sub 0 in for x
2.5y + 3x = 21
2.5y + 3(0) = 21
2.5y = 21
y = 8.4

check....
2.5(8.4) + 3(0) = 21
21 = 21 (correct)

answer : x = 0, y = 8.4

I think I did that right.....?

anonymous · Answer

Thanks!!!!(:

texaschic101 · Answer

your welcome :)