how to graph y=3/4x.

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You should not expect somebody just to do your homework for you.

for y=(3/4)x isn't the y-intercept zero?
so the origin is one point.

the slope is 3/4, slope is rise over run.
so from the origin take a "run" of 4 followed by a "rise" of 3, giving you a second point.
See how easy it is???

Let me know what you got for the others so far.