Question 294938
I need to graph a line with slope -1/2 that pases through the point (0,2) 
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Plot the point (0,2)
The slope is -1/2, = diffy/diffx.  That's down 1 square for 2 squares to the right.
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Find a 2nd point by counting 2 squares positive x and 1 square down.  That's (2,1)
Draw a line thru them.