Question

The scatter plot shows the linear model for Variable A and Variable B.

What is a possible value for Variable B when Variable A is 40?



http://static.k12.com/calms_media/media/1549000_1549500/1549027/1/9cd4eb2f2808e4e91821f803806493dd98013d3f/MS_IMC-141015-1081510.jpg

@Michele_Laino

Answer 1

hint:
your line passes at point (10,20) and (70,80), so what is its equation

Answer 2

(20-80) (10-70)? @Michele_Laino

Answer 3

@robtobey

Answer 4

no, I meant this:
\[\large \frac{{y - 20}}{{80 - 20}} = \frac{{x - 10}}{{70 - 10}}\]
please simplify

Answer 5

do i subtract straight across?

Answer 6

hint:
\[\begin{gathered}
y - 20 = x - 10 \hfill \\
y = ...? \hfill \\
\end{gathered} \]

Answer 7

y=-20?

Answer 8

we have:
\[\large y = x + 10\]

Answer 9

so what do you get if we set x=40?

Answer 10

that would be 40 + 10?

Answer 11

no, we have:
y= 40+10=50, so we get the subsequent point:
(40, 50)

Answer 12

ok

Answer 13

that's the possible value of B, namely 50

Answer 14

so the answer is 50?

Answer 15

yes!

Answer 16

THANK YOU @Michele_Laino

Answer 17

Thank you! :)