Select all that apply. Which graphed lines represent direct variation functions?
Line a
Line b
Line c
Line d

The lines on the graph that shows the direct variation variation are
Using the slope of a line, a positive slope tells us that the line is increasing.
From the left to the right of this graph, it shows that a person is climbing. A negative slope tells us that there is a fall.
We have
y = 1/2 x
This shows that it is a positive slope
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