Question

The scatter plot below shows the weights in ounces of several kittens at various ages. What is the best equation of the trend line through these points?

A.



y = 10x


B.



y = 4x


C. y = 1/4x + 10


y = 4x + 10

Answer 1

This is how you proceed for slope-intercept equations.
From the graph, read off the y-intercept (=10).
Read off the slope (about 15).
Check the 4 options to see which one satisfies both conditions.
If you can use help reading off the slope and intercept, please post.

Answer 2

what do you mean

Answer 3

Are you familiar with how to find the y-intercept of a given equation in slope-intercept form?

Answer 4

not really

Answer 5

An equation y=mx+b is in slope-intercept form, where m=slope and b=y-intercept.

Answer 6

@jayda ok so far?

Answer 7

yes

Answer 8

From the given graph, can you spot the y-intercept?

Answer 9

would it be 1?

Answer 10

no. Y-intercept is where the curve (line in this case) intersects the y-axis. Can you read it off?

Answer 11

so the y intercept is where you have the curved line?

Answer 12

Can you figure out the y-intercept of the given graph?

Answer 13

ohh . okay . yes

Answer 14

can you do the rest now?

Answer 15

What is the approximate slope and what is the intercept?

Answer 16

isnt the intercept 10 though?

Answer 17

@mathmate ?

Answer 18

Right, y-intercept is 10.
Did you find the slope?

Answer 19

would it be 4?

Answer 20

would the answer be D?

Answer 21

Your answer D is correct.
You have eliminated A and B because the y-intercepts there are zero. Good job.
Between C and D, the difference is the slope. The graph shows that y increases from 10 to 14 between 0 and 1. This implies a slope of (14-10)/(1-0)=4.
Therefore answer D is correct.

Answer 22

thank you so much ! (:

Answer 23

yw! :)