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Scilla [17]
3 years ago
8

What is the slope of the line represented by the equation y = -x - 3?

Mathematics
1 answer:
bezimeni [28]3 years ago
6 0

slope intercept formula

y= mx+b

y = -x - 3

pretend that there is a -1 in front of x

slope is also m

b= y-intercept

Answer: slope= -1

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2. Wilton drives a taxicab. He charges $40 per hour. One passenger gave Wilton a tip of $30. He gave Wilton a total of $150. He
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 The unknown is rather the question of how many hours the taxi drove. We can give it the symbol X.

Your equation would be: 40x + 30 = 150

(SOLVED):
40x +30(-30) = 150(-30)
40x= 120
40/40=120/40
x=3

*The driver drove the passenger for 3 total hours*

Hope this was helpful to you! Have a good one.
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1 year ago
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PLEASE HELP
valina [46]

Answer:

Step-by-step explanation:

You have 3 unknowns: a, b, and c.  It's our job to find them algebraically.  I'm going to start with the point where x = 0 and y = 7.  You'll see why in a minute.  Filling in the standard form of a quadratic

y=ax^2+bx+c  using (0, 7):

7=a(0)^2+b(0)+c  gives you that c = 7.  We will use that value now when we write the next 2 equations.  Now the point (-2, 19):

19=a(-2)^2+b(-2)+7  and

19=4a-2b+7 so

12 = 4a - 2b

Now for the next point (-1, 12):

12=a(-1)^2+b(-1)+7  and

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5 = a - b

Now we have a system of equations (the 2 bold font equations) that we will solve by elimination:

 12  =  4a  -  2b

  5  =   a   -    b

Multiply the bottom equation by -4 to get a new system:

 12  =  4a  -  2b

-20  = -4a  +  4b

Add those together to get rid of the a terms and end up with

-8 = 2b so

b = -4

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5 = a - (-4) and

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y=x^2-4x+7

7 0
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