point-slope form

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momof3

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Dec 10, 2008
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My daughter missed this on an exam and I do not see why? Can someone show why her answer is wrong? I have done this problem over and over and I am obviously missing something. thanks. The question states:

Write the point-slope form of an equation for a line that passes through the point with the given slope. (-4,3) and m=1

a) y -3 = 1 (x+4) c) y - 3 = 1(x - 4)
b) y = 3 = 1(x +4) d) y - 3 = - (x + 4)

She answered : A
 
The point-slope formula is:

y - y1 = m(x - x1)

The given point is (-4, 3), which means x = -4 and y = 3.

The slope is represented as m = 1.

So, let's plug this into the formula and see what happens.

y - (3) = 1(x - (-4))

y - 3 = 1(x + 4)

So, your daughter is not wrong. The teacher is wrong.
 
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