Posted by **Anonymous** on Monday, December 9, 2013 at 12:55pm.

If (x,7) is a solition to the equation 5x-y=3, what is the value of x?

- MATH -
**SAM**, Monday, December 9, 2013 at 1:09pm
5X-Y=3

-5X -5X

-Y=3-5X

DIVIDE BY -1 ON BOTH SIDES

Y=-3+5X

PLUG IT IN PLUG IT IN

7=3-5(X)

SOLVE

SUBTRACT BY 3 ON BOTH SIDES 4=5X

AND DIVIDE BY -5 ON BOTH SIDES 4/5=5/5X

4/5=X

- MATH -
**SAM**, Monday, December 9, 2013 at 1:10pm
CORRRECTION!!!!

-4/5!

- MATH -
**X**, Monday, December 9, 2013 at 2:57pm
Here, all you have to do is substitute (7) for (y) in the equation. You can do this because all coordinates are of the form (x,y), and any number that is in the place of (y) in this format can be seen as equal to (y).

The working is shown below:

5x - (7) = 3

5x = 10

x = 2

As shown in the working above, x = 2 when y = 7.

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