Can some one answer my last 3 questions for the day? it answer choice and for 30pts!

brainliest, rattings, , etc

6  C = 2+12r

7.y = .026x -.05

8.The slope is 5 and the y intercept is -2

9  x= 3

Step-by-step explanation:

6.  The cost of the arrangement is the cost of the vase plus the cost of 12 roses

C = vase +12 roses

Each vase is 2 dollars and each rose costs r

C = 2+12r

7.  We need to find the slope

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

   =( 5.15 -1.25)/ (200-50)

    (3.9)/150

  .026

We know the slope and a point we can use point slope form

y-y1 = m(x-x1)

y -1.25 = .026(x-50)

Distribute

y-1.25 = .026x -1.3

Add 1.25 to each side

y-1.25+1.25 = .026x -1.3+1.25

y = .026x -.05

8.  y = 5x-2

This is written in slope intercept form y= mx +b where m is the slope and b is the y intercept.

The slope is 5 and the y intercept is -2

9.  The x value does not change in this vertical line.  Vertical lines are x=

x= 3

first one because it can't have a fraction in it

step-by-step explanation: