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The point (21,32) is on a line with a slope of 1.5. How do i make an equation?

i know the slope is 1.5 so all i got in my equation is y=1.5x i need to know what b= or the y intercept. how do i do that? (y=mx+b)

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1) Put the point and the slope into the
slope-intercept equation for a line,
y = mx + b and solve for b.
32 = 1.5(21) + b
32 = 31.5 + b
-31.5 -31.5
0.5 = b
2) Plug m = 1.5 and b = 0.5 into
the sl.-int. equation.
y = 1.5x + 0.5. ANSWER
(Comment if you have any questions.)

Comments (6)
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oh i think ive over thought that i couldnt gaet at all
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i mean i couldnt get it
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Well, tell me if I can help anymore.
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this was really helpful thanks :)
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Anytime!!
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ok ;) ill follow you will that be fine?
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Add a comment...

If u have graph paper plot the point on a graph and then use your slope to make a line that crosses the y axis, then u have your y intercept...hope this helps :)

Comments (8)
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it does but making a graph that long will take long and also how do we graph the 1.5 for slope? i dont get that part
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Make 1.5 into a fraction that is NOT a mixed number, and by chance did u learn a method called rise over run?
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yeah i did
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Use that method...and btw, what grade are u in?
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8th i have algabra lol
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Oh I'm ninth, do u have the answer now?
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unh no not yet but what i still dont get does that mean i go 1 whole square up and a half? or how thats what i dont get
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You can do this by graphing but it's hard to be accurate when you're dealing with large numbers and decimals or fractions.
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