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Crank
3 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]3 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]3 years ago
3 0
Y=-5x-7. I'm almost certain but you never know
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The best prediction of the height of a student with an arm span of 143 cm is 143 cm

Step-by-step explanation:

The missing graph is attached

The graph below shows the heights and arm spans of students in

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∵ The graph does not contain the value of the given arm span

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∵ y = x

∴ 143 = x

∵ x represents the height of a student

∴ The height of the student is 143 cm

The best prediction of the height of a student with an arm span of 143 cm is 143 cm

Learn more:

You can learn more about line best fit in brainly.com/question/8955867

#LearnwithBrainly

3 0
3 years ago
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Systems of equations.<br><br> Y= -3x+1<br> Y=x-3 How do i start it
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Answer:

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