Question

A picture is enlarged by keeping its width the same and increasing its length. The scatter plot below shows the perimeter of the picture (y) for different lengths (x):

plot the ordered pairs 20, 60 and 30, 80 and 40, 100 and 50, 120 and 60, 140

Which function best represents the data in the scatter plot?

y = 2x − 20
y = 2x + 20
y = x − 20
y = x + 20

Answer 1

well first, find the slope, y2 - y1/x2 - x1

Answer 2

so ill give you this 120 - 60/50 - 20

Answer 3

subtract that by yourself and tell me what you get

Answer 4

60/30 thats what I got

Answer 5

@ccswims

Answer 6

ok, simplified it is 2/1. so, we now have the slope of our equation

y = 2x + b. but we still need to find b (or where the y intersects.)

Answer 7

Ok

Answer 8

now, using our slope, we must change it to 1/2 because we are going backwords.

So, do 60 divided by 0.5

Answer 9

I mean MULTIPLY 60 by .5

Answer 10

sorry, if you divided that would be wrong, multiply them

Answer 11

lol ok

Answer 12

its 30

Answer 13

ok, so it is

y = 2x + 30

Answer 14

but my answers are y = 2x − 20
y = 2x + 20
y = x − 20
y = x + 20

Answer 15

ok, go with y = 2x + 20. it cant be -20 because it is a positive y intersect, not a negative, and we know it is a slope of 2.

Answer 16

ok