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Crank
2 years ago
14

Find an equation of the line that goes through the points (7,-42) and (10,-57). Write your answer in the form

Mathematics
2 answers:
aksik [14]2 years ago
4 0

Answer:

y = -5x - 7

Step-by-step explanation:

What's the slope of this line?  Going from  (7,-42)  to  (10,-57), we see x increasing by 3 and y decreasing by 15.  Thus, the slope is m = rise / run = -15/3, or m = -5.  

Now subst. -42 for y in y = mx + b, -5 for m and 7 for x:

-42 = -5(7) + b.  Thus, b = -42 + 35, or b = -7. and the equation of this line is thus   y = -5x - 7.

Check:  if x = 10, does this equation yield y = -57?  Yes

tatuchka [14]2 years ago
3 0
Y=-5x-7. I'm almost certain but you never know
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Fynjy0 [20]
When you square a negative number, the result is positive.
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6 0
3 years ago
653 divided by 7<br>459 divided by 4<br>2354 divided by 9
olya-2409 [2.1K]
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3 0
3 years ago
4. A craft store offered sewing classes on 12 of the 30 days in November.
Shkiper50 [21]

Answer:

A. 0.4

Step-by-step explanation:

Write 12 of 30 as a fraction:

12/30

Convert this to be a fraction over 100 by setting up an equation:

Variable x = proportional answer to 12/30

12/30 = x/100

Cross multiply:

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40 = x

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Convert this number into a decimal by adding a zero and decimal point before the "4" in 40:

0.40

Simplify:

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I converted it into a decimal through the use of fractions, but you can also find the answer by doing long division: 12 ÷ 30. However, showing work for long division over a message is too complex so I solved the problem this way instead.

5 0
2 years ago
Twenty sharpened pencils are placed in a box containing an unknown number of unsharpened pencils. suppose 15 pencils are removed
loris [4]
Assuming that the 15 samples has a normal distribution. then the fraction of the sharpened pencil = 5 / 15 = 1 / 3

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6 0
3 years ago
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