Question

Which of the following equations for the line of best fit represent data sets that have a positive linear relationship? Check all that apply.

A. y=88.5 - 8.8x
B. y=13.89 - 2.9x
C. y=100+2.03x
D. y= -0.0025 - 0.8x
E. y= 170.8+5.9x

Answer 1

All its asking is what line would fit the points. "Positive linear relationship" just means positive slope; in y=mx+b, the m, or slope, is positive. There are only 2 answers with a positive slope. From then, you just see what would most accurately fit the points (I'm assuming you have them). If they give you a x-value, plug it in and see if it is close to that of the graph's point (its y-value).

Answer 2

I suck with formulas, they just don't make sense to me, does it matter that D for example has a negative in it? -0.0025?

Answer 3

Positive linear relationship means the best-fit line has a positive slope, only C and E qualify, as x has a positive multiplier..

Answer 4

Thanks so much