Question

Graph the data in the table below. Which kind of function best models the data? Write an equation to model the data.

quadratic; y = –x2 + 2x – 3
linear; y = – 2x – 3
exponential; y = –3•1.5x
quadratic; y = –x2 – 3

Answer 1

@jim_thompson5910

Answer 2

what do you have so far (in terms of work)?

Answer 3

I dont understand how to do it

Answer 4

ok let's say we pick on choice B

linear; y = – 2x – 3

Answer 5

IF the answer was choice B, then (0,-3) should lie on the graph

so should (1,-2) and (2,-3) etc etc

Answer 6

but what is the value of y when x = 1

y = – 2x – 3
y = -2*1 - 3
y = ??

Answer 7

-5?

Answer 8

yes so (1,-5) is actually on y = – 2x – 3

not (1,-2)

Answer 9

this eliminates choice B

Answer 10

ok

Answer 11

test the points with the other equations. You need to make sure all points fit

Answer 12

so would i do -2*2-3?

Answer 13

nvrm!

Answer 14

well you could, but we proved B wasn't the answer. So there's no need to check B any more

Answer 15

got it nvrm lol

Answer 16

alright

Answer 17

Would the answer be A?

Answer 18

yes

Answer 19

Thank You!. I never understood those but now I do. A lot simpler than I thought.