hali12
Please help.... Will give medal for best anwser....
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hali12
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mathteacher1729
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What is the slope of the line?
hali12
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idk?
hali12
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4, 1 & 1/2
mathteacher1729
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Not quite.. I'm not sure how you are getting those numbers.
hali12
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idk how to do this math :/
ZakaullahUET
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|dw:1350139808849:dw|
y=mx+b is the slope intercept form put values in it
mathteacher1729
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Slope-intercept is basically a very short way of describing ANY straight line. It can be super useful in figuring out, say, how much money you make if you get paid an hourly wage.
mathteacher1729
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The slope is "rise over run" or the ratio (fraction) of how far up or down the line goes for every bit it moves left or right.
mathteacher1729
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In this case, for every "rise" of negative 3 (going down three) the line goes one to the right.
hali12
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so -3, 1?
mathteacher1729
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So slope = -3/1.
Slope = -3 (because any number divided by 1 is itself).
hali12
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well -3 / 1
mathteacher1729
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Yup, that's the slope.
hali12
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thanks.. (:
mathteacher1729
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Now the INTERCEPT just means "what value of y does this line cross the y-axis" the intercept is literally JUST A NUMBER. :)
hali12
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4
mathteacher1729
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So look at your picture. What value of y does the line cross (or touch, or intercept, they all mean the same thing) the y-axis?
mathteacher1729
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Yup! :D
hali12
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yay!
mathteacher1729
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The slope intercept form of a line is
y = mx + b
where m is the slope (-3) and b is the intercept (4).
Literally re-write that but instead of m write -3 and instead of b write +4
and you're done. :)
hali12
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so, 4=-3x +4?
hali12
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or y=-3x+4?
mathteacher1729
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The second one.===> y=-3x+4
The crazy thing is... that describes the ENTIRE line. All the points on the line obey that equation.
Question -- what is the value of Y on the line when X = 2? (look at your picture)
hali12
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uh...