A line passes through the point (6, -7) and has a slope of -2 . Write an equation for this line.

i think there was a formula for that but i forgot it

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- Jan 10th 2013, 06:23 AMphyfreakhow to find the equation? (easy question)
A line passes through the point (6, -7) and has a slope of -2 . Write an equation for this line.

i think there was a formula for that but i forgot it - Jan 10th 2013, 06:35 AMTheRhino1987Re: how to find the equation? (easy question)
Use the formula Y = mx + b

The point you gave us has values (x,y) and the slope you gave us is 'm'

Knowing this...

-7 = (-2)(6) + b

-7 = -12 + b

b = 5

Now we write out the formula using the y-intercept(b) we calculated

Y = -2x + 5 - Jan 10th 2013, 06:48 AMSorobanRe: how to find the equation? (easy question)
Hello, phyfreak!

Quote:

A line passes through the point (6, -7) and has a slope of -2 .

Write an equation for this line.

i think there was a formula for that, but i forgot it.

**Point-Slope Formula**

The line through the point $\displaystyle (x_1,y_1)$ and having the slope $\displaystyle m$,

. . has the equation: .$\displaystyle y - y_1 \:=\:m(x-x_1)$