SOLUTION: I'm having a hard time understanding this system and I just need a break down of how to do this please. The problem is: Solve the system by using substitution 3x = 4y = 9 y = x

Question 132678This question is from textbook Connected Mathematics2
: I'm having a hard time understanding this system and I just need a break down of how to do this please.
The problem is: Solve the system by using substitution
3x = 4y = 9
y = x - 3
This is in Prentice Hall Connected Mathematics 2 Book Grade Eight This question is from textbook Connected Mathematics2

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The problem is: Solve the system by using substitution
3x = 4y + 9
y = x - 3
------------
Substitute to solve for "x":
3x = 4(x-3) + 9
3x = 4x-12+9
3x = 4x-3
Subtract 3x from both sides: Add 3 to both sides:
x = 3
----------
Substitute to solve for "Y":
y = x-3
y = 3-3 = 0
---------------
Solution: (3,0)
====================
Cheers,
Stan H.

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