Posted by Jake on Monday, January 26, 2009 at 8:44pm.
Graph y=2x+1, then choose 3 points above the line. Give the coordinates of each point and tell wether it is greater than, less than or equal to
2x + 1 at each point.

algebra  Reiny, Monday, January 26, 2009 at 9:04pm
for any point that you choose above the line, the ycoordinate of that point would be greater than 2x+1

algebra  Jake, Monday, January 26, 2009 at 9:18pm
Doesn't the line go on forever, so how could you choose 3 points above it?

algebra  Reiny, Monday, January 26, 2009 at 9:28pm
did you draw the line.
for any line, unless it is vertical, you can be either above or below the line.
e.g. for your y = 2x + 1
consider (6,5), below above the line.
Why?
substitute the value x = 6
then y = 2(6)+1 = 13, but the y for your point was 5
since 5 < 13, the point (6,5) is below the line.
consider (3,15)
if x=3 in the equation y = 6+1 = 7
since 15 > 7, the point (3,15) is above the line.
Draw any nonvertical line on a piece of paper. Isn't there a region above that line and a region below that line no matter you imagine that line to go ??
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