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wt exactly r u stk on???
I honestly have no idea what you're asking. A bit more info and we can try help you...
It hards to say what to do as you havent specified enough information
say they give you an equation of a graph e.g- y=2x-3
we know -3 is the y-intercept so it will cut the y axis at -3
the best way i would say is to do a table of values
so on the first row you have x ( so like term number -4to4)
the second row will be 2x ( so times x by 2)
third row will be -3 , so write -3 in all boxes
add all the values together and that will give you the axis value for y
plot x and why on the graph, and you should have a straight line!
whoops meant y not why :P but hope it helps!