SOLUTION: This is the equation 4x+3Y=12. The instructor picked the three coordinates a. X is 0, Y is 4 - I understand the equation for this b. X is 3 and Y is ) Do not understand how th

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: This is the equation 4x+3Y=12. The instructor picked the three coordinates a. X is 0, Y is 4 - I understand the equation for this b. X is 3 and Y is ) Do not understand how th      Log On


   

Question 134719: This is the equation 4x+3Y=12. The instructor picked the three coordinates
a. X is 0, Y is 4 - I understand the equation for this
b. X is 3 and Y is ) Do not understand how the equation was solved with the Y being 0?
c. X is 4 and Y is -1.33 or -4/3 . Again how was the equation solved to get this coordinate
Thank you
Found 2 solutions by vleith, josmiceli:
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
You are given a function with two variables in it X and Y.
You are then given a value for one variable and asked to find solve for the other one.
1) X = 0
4x%2B3Y=12
4%2A0++%2B+3Y+=+12+
+3Y+=+12
Y=+4
2) Y=0
4x%2B3Y=12
4x%2B3%2A0=12
4x+=+12
+x+=+3
3) X= 4
4x%2B3Y=12
4%2A4%2B3Y=12
+16+%2B+3Y+=+12
+3Y+=+12+-+16
+3Y+=+-4+
+Y+=+-4%2F3
Make sense?

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
You're confusing yourself with language. What your teacher is giving
you are points, not co-ordinates. If you are given a pair like this
(3,7) the 3 is a co-ordinate, the 7 is a co-ordinate, and together
they make up the point, (3,7). If you substitute EITHER the 3 for X
or the 7 for Y in the proper equation, which might be
3y = 7x, you will solve for the other co-ordinate. Getting the language
of algebra straight is very important.