Question

X(years since 1991) Years 2,5,7,8
y(Book sales billions$) 18,21,23,24

Write an equation in slope-intercept form to represent the data

Answer 1

first find the slope, get points (2,18) and (5,21) use slope formula

Answer 2

using that y1 y2 x1 x2?

Answer 3

yes

Answer 4

y2 - y1
-------
x2 - x1

Answer 5

21-18
------
5 -2

Answer 6

is that right

Answer 7

correct, so what is the slope

Answer 8

1

Answer 9

whats the next step

Answer 10

ok use formula y = mx + b to find b, you have m and take any points for x,y, you can use *(2,18)

Answer 11

tell me if im right so far 18=1(2)=b

Answer 12

good

Answer 13

so what is b

Answer 14

18=2+b
18-2=b
b=16

Answer 15

ok, so the equation you are looking for is in form of y = mx + b

y = x + 16

Answer 16

there we go ty

Answer 17

yw :)