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NikAS [45]
3 years ago
13

Determine whether the three points A(-2,-1), B(0,4) and C(2,9) all line on the same line.

Mathematics
1 answer:
sashaice [31]3 years ago
8 0
All three of them do exist on the line y = 2.5x + 4

In order to find the answer to this question, start by finding the line for two points. For this example, we'll use A and C. 

First we need to find the slope. 
(y1 - y2)/(x1 - x2)
(9 - -1)/(2 - -2)
(9 + 1)/(2 + 2)
10/4
2.5

Now using slope intercept form and point A, we can determine the intercept of that line as well. 

y = mx + b
-1 = 2.5(-2) + b
-1 = -5 + b
4 = b

So now we know A and C form the line y = 2.5x + 4. We can then check if B fits that line. 

y = 2.5x + 4
4 = 2.5(0) + 4
4 = 0 + 4
4 = 4 (TRUE)

Therefore, it also falls on that line. 
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A department store sold 51 51 shirts one day. All short-sleeved shirts cost $14.00 $ 14.00 each and all long-sleeved shirts cost
Dmitrij [34]

Answer:

28 short-sleeved shirts were sold and 23 long-sleeved shirts were sold.

Step-by-step explanation:

We can solve this question by a system of equations.

I am going to say that:

x is the number of short-sleeved shirts sold.

y is the number of long-sleeved shirts sold.

A department store sold 51 shirts one day.

This means that x + y = 51

All short-sleeved shirts cost $14.00 each and all long-sleeved shirts cost $23.00 each. Total receipts for the day were $921.00.

This means that

14x + 23y = 921

How many of each kind of shirt were sold?

We have to solve the system of equations.

x + y = 51

x = 51 - y

--------------

14x + 23y = 921

14(51 - y) + 23y = 921

714 - 14y + 23y = 921

9y = 207

y = \frac{207}{9}

y = 23

--------

x = 51 - y = 51 - 23 = 28

28 short-sleeved shirts were sold and 23 long-sleeved shirts were sold.

7 0
3 years ago
What is the answer for all these numbers
Leya [2.2K]
3=12
4=13
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6 0
3 years ago
What is the y-intercept of the equation 8x – 3y = 24?
Levart [38]

Answer:

-8

Step-by-step explanation:

Create this equation into a y=mx+b form

8x-3y=24

-8x       -8x           -8 to solve for -3y

-3y=-8x+24

----    ---   ---              divide by -3 to leave y by itself

-3      -3   -3

y= 8

    --- x-8

     3

y intercept is -8

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Step-by-step explanation:

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