what is the line joining (-4,1) and (-2,5)

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- May 28th 2010, 06:09 PMalysha230893line joining
what is the line joining (-4,1) and (-2,5)

- May 28th 2010, 06:11 PMProve It
- May 28th 2010, 06:13 PMIllusion3
Firstly, you need to find the gradient, in the form

y=mx+c

The formula for gradient is

(y1-y2)/(x1-x2)

so

(5-1)/(-2--4) = 4/2 = 2

So you know that the line is y=2x+c

Now substitute one of the points into the equation

1=2(-4)+c

1=-8+c

so 9 = c

So the equation of the line is

y=2x+9