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Suppose the equation is y = mx+c

The slope = m is 4 so y = 4x+c

(-2,1) lies on the line so substitute x=-2, y=1 into the equation of the line.

1 = 4*(-2)+c or 1 = -8+c or c = 9

So the equation is y = 4x + 9

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Q: Write the equation of a line that passes through the point -2 and 1 and has a slope of 4?
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