SOLUTION: is (-1,2) a solution of y= 1/2x-1?

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Question 106863: is (-1,2) a solution of y= 1/2x-1?
Found 2 solutions by jim_thompson5910, Earlsdon:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
y=%281%2F2%29x-1 Start with the given equation


Let's test the first solution (-1,2):


%282%29=%281%2F2%29%28-1%29-1 Plug in x=-1 and y=2


2=-1.5 Simplify. Since the two sides of the equation are not equal, this means (-1,2) is not a solution to y=%281%2F2%29x-1


Now let's graph the equation y=%281%2F2%29x-1 and plot the points (-1,2)



Notice the point is not on the line. So this shows that (-1,2) is not a solution to y=%281%2F2%29x-1

Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Is (-1, 2) a solution of y+=+%281%2F2%29x-1?
You can find out by simply substituting the x- and y-coordinates of the given point into the equation. If the equation is still valid (the two sides are equal) then the point is a solution; if it isn't then it aint!
Let's try it.
2+=+%281%2F2%29%28-1%29-1 Simplify.
2+=+%28-1%2F2%29-1
2+=+-1.5 No cigar!
The given point is not a solution of y+=+%281%2F2%29x-1