Posted by Anonymous on Monday, December 9, 2013 at 12:58pm.
If (2,y) is a solution to the equation 2x3y=5, what is the value of y?

MATH  SAM, Monday, December 9, 2013 at 1:04pm
2X3Y=5
2X 2X
3Y=52X
DIVIDE BOTH SIDES BY 3
Y=5/3+2/3X
NOW DO THE SAME FOR THE OTHER ONE PLUG THE 2 IN FOR X
Y=5/3+2/3(2)
PUT IN CALC WATCH SIGNS!!
Y=3

MATH  X, Monday, December 9, 2013 at 2:53pm
All you have to do in this situation is substitute (2) for the variable (x) in the equation. You can do this because all coordinates are of the form (x,y). Anything in the place of (x) can be seen as equal to (x). So, substituting, we can see:
2(2)  3y = 5
4  3y = 5
3y = 9
y = 3
As shown above, we can see that y = 3 when x = 2.
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