Jessica sold half of her comic books and then bought 7 more. She now has 15. How many did she begin with ?

16

Step-by-step explanation:

1) Subtract 7 from 15. 15-7=8

2) Multiply 8 by 2. 8x2=16

Therfore your answer is 16.

(3x-8) or (3x+8)

step-by-step explanation:

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