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daser333 [38]
3 years ago
6

A line passes through the points (8, –1) and (–4, 2). What is the y-intercept of this line?

Mathematics
1 answer:
Darina [25.2K]3 years ago
4 0
Y=mx+b
m=slope
b=y intercept

alrighty, find the slope

slope between (x1,y1) and (x2,y2) is (y2-y1)/(x2-x1)

the slope between (8,-1) and (-4,2) is (2-(-1))/(-4-8)=(2+1)/(-12)=3/-12=-1/4

y=(-1/4)x+b
find b
subsitute a point
(8,-1)
x=8 and y=-1
-1=(-1/4)(8)+b
-1=-2+b
1=b

the  y intercept is y=1 or the point (0,1)
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Step-by-step explanation:

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On substituting the values in (1) we get:

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Step-by-step explanation:

A)

Suppose you rent for x hours and each hour costs $15.75

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Moreover, there is a $25 dollar (fixed) deposit for renting, so that gets added to your payment. All in all, you have to pay 25+15.75x

This is the equation of renting a snowboard for x hours.

Equation is c=25+15.75x

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To know how much it will cost, you simply plug in 4 into x (in the equation):

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3 years ago
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