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Is it (0,25) or (25,0)? Either way, the process is the same:

y=mx+b (This is slope intercept form, m is the slope, b is a constant which you add initially when graphing)

Substitute what you know.

y=3x+b [Now put in the point that you would need to solve for b. As an example, I'll solve for (0,25) ]

25=3(0)+b

25=b Now put b back into the original, before you substituted the x and y.

y=3x+25

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