Question 439330: Line L contains the points (0,4) and (2,0). Show that the point (–25,81)
does o r does not lie on line L.
Answer by rwm(914)   (Show Source):
You can put this solution on YOUR website! simplest way is to graph it.
But i suspect since you chose linear equations as the category that you want to find the equation of the line.
or we could just find the slope of the line that goes through -25,81 and 0,4 to see if it is the same slope as the line that goes through 0,4 and 2,0
slope is the change in y over the change in x
4-0/0-2
4/-2=-2
y=mx+b
y=-2x+b
4=-2*0+b
4=b
y=-2x+4
81=-2*(-25)+4
81=50+4
81=54
not on the same line
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