The expression 0.09x+(x−30) models the final price of a bicycle with an instant rebate in a state that charges a sales tax. The tax is on the original price. Which expression represents the amount of tax that is paid on the bicycle? A. x−30
B. 0.09x
C. 1.09x
D. 0.09x−30

B. 0.09x

Step-by-step explanation:

x is the initial price.

0.09x is the 9% sales tax.

-30 is the instant rebate.

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4

3

step-by-step explanation: