EmmaH
Could spomeone please take the time to help me understand this?? Write the point-slope form of the equation passing through (5, -1) with a slope of 6.
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EmmaH
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these are the answers :
y-1=6(x+5)
y+5=6(x-1)
y+1=6(x-5)
y-5=6(x+1)
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point slope form
y-y1=m(x-x1)
m=slope
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y-(-1)=6(x-5)
y+1=6(x-5)
EmmaH
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there is only one set of numbers how can i find m?
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slope is given in question see it
EmmaH
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oh so m=6
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any more question about this
kymber
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|dw:1352221469604:dw|
EmmaH
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am i using y=mx+b?
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you cant use this because you didnt know what is b (y-intercept)
EmmaH
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ok then what? k=mx?
kymber
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y=mx+b is slope-intercept form. This is point-slope form. You use point-slope form. All you do is plug in the numbers. That's all you do. Look at what I drew it explains it all. M is the slope and (x, y) is the point given.
EmmaH
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y-y1=m(x-x1)??
EmmaH
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oh and if i suddenly go off line itsbecause we dont have elctricity and my battery is dying
kymber
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|dw:1352222119451:dw|
EmmaH
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6(-5-5(1)?
brinethery
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First, we find the y-intercept. -1 = 6(5) + b
EmmaH
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1-1(1)=6
5-51)
EmmaH
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those two are appart of the sam equation..
brinethery
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Once you solve for b, you have your slope (m=6) and y-intercept. I calculated it and found b= -1-30 = -31
y = 6x + (-31) therefore, y = 6x -31
EmmaH
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so we are using y=mx+b?
kymber
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|dw:1352222244438:dw|
EmmaH
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um how did you find b?
brinethery
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Do what Kymber did. That's another way to write the equation of a line. You end up with the same result.
kymber
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It says "point-slope form", that is not y=mx+b. The answer choices you gave are in point-slope form. I don't know why Brinethery is talking about slope-intercept form.
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i have told u already