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KrystaRenee What is an equation for the line that passes through points (–1, –4) and (1, 4)? Write the equation in slope-intercept form. y = 4x y = –4x y = –1x – 4 y = –4x + 1 one year ago one year ago

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1. nubeer

do you know how to find gradient?

2. KrystaRenee

Not really.

3. KrystaRenee

The x1 y1 and such? I think.

4. nubeer

yes .. that very same.. gradient = (y2-y1)/(x2-x1) try and find out what the gradient is.

5. KrystaRenee

I did that and my answer was wrong.

6. nubeer

ok tell me what is your gradient and i will tell you where u went wrong.

7. KrystaRenee

I got 8/2. I don't know how to write it in slope intercept form though, if I am right.

8. guest1234

First, find the slope$\frac{ y_2-y_1 }{ x_2-x_1 } = slope(m)$ |dw:1352443299408:dw| then plug into point-slope form $y-y_1=m(x-x_1)$ y-(-4)=4(x-(-1)) y+4=4(x+1) multiply 4 to (x+1) y+4=4x+4 subtract 4 from the left side y=4x

9. nubeer

there you go someone solved for u.

10. KrystaRenee

So I was right lol cool I just didn't know how to put it in slope intercept form. Thanks to you both.

11. nubeer

no problem at all.. just keep the formula's in your mind .. that's it