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and our functions are? if you can post a screenshot it may prove useful

also, define for us what is meant by "best".

f(x) = 9 − 10.3x
f(x) = −10.3 + 9x
f(x) = −9 + 10.3x
f(x) = 10.3 − 9x

ok, is the slope going to be positive or negative?

positive

then we can rule out 2 options at the start

wait no the first & last one

we want to keep b and c

so, how do we define a reasonable slope? any ideas?

y/9=10.3 ?

i agree

a slope of 9 gets us to 81, too short, so the 10.3 has to be better

another sort of test, let x = 10
-10.3 + 9(10) < 90
-9 + 10.3(10) > 90

-10.3 + 9(10) < 90

what is 90 - 10 ?

notice our point at x=10 is about 95, or greater than 90

f(x) = −10.3 + 9x ?

if thats your pick for an answer, im going to disagree.

we want about 95 when x=10
what is -10.3 + 9(10) ?

its -10.3+9x

you havent answered my question

or, are you saying that is what some answer key gives you? you arent being very clear to me.

im saying that one of the answer choices i thought it was .... sorry

thats what i had thought you meant but wasnt sure.
-10.3 + 9(10) = 79.7
|dw:1432953041331:dw|

do you see that we are not very close to where we need to be?

yea

-9 + 10.3(10) = 103-9 = 94

so out of the 2 options
f(x) = -9 + 10.3x seems to work better for us

yea it does

good luck :)