SOLUTION: Use the method of substitution to solve the system of linear equations. 2x-y=4 9x-4y=21 The solution is ______. Please show work! Thank you This what I have tried t

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Use the method of substitution to solve the system of linear equations. 2x-y=4 9x-4y=21 The solution is ______. Please show work! Thank you This what I have tried t      Log On


   

Question 631566: Use the method of substitution to solve the system of linear equations.
2x-y=4
9x-4y=21
The solution is ______.
Please show work!
Thank you
This what I have tried thus far:
2x-y=4
y=2x-4
9x-4y=21
9x-4(2x-4)=21
Found 2 solutions by richwmiller, stanbon:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
So keep going.

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
2x-y=4
y=2x-4
9x-4y=21
9x-4(2x-4)=21
------
9x-8x+16 = 21
x = 5
----
Xolve for "y":
y = 2x-4
y = 2*5-4 = 6
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Cheers,
Stan H.