y=mx+b is the slope-intercept form of a function. If you are given the slope and y-intercept, use that.
If you're given the slope and one point, call it (a,b) then you could use the point-slope form.
y-b=m(x-a)
For example if you're told a line has a slope of 4 and a point on the line is (0,3) then the equation is
y-3=4(x-0)
y-3=4x
y = 4x + 3
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