Question

How do you find y-intercept?

Answer 1

set x=0

Answer 2

I dont have an x. i have y=8x+ something. i need the 'something'. my two points were (2,20) (3,28)

Answer 3

see first put in th first pair of numbers as x and y to find that 'something'

Answer 4

What do you mean?

Answer 5

lets say uve got y=8x+b
now substitute

x=2 , y=20
20=8(2) + b
b=4
now uve got

y=8x+4

Answer 6

now set x=0

Answer 7

Oh i get it! Thanks much.

Answer 8

and infact in the form y=mx+b

b is always the y-intercept...think it this way..that on the y-axis , x is always zero, and so thats the condition u use to find it

Answer 9

ohhhh !

Answer 10

You can also do it by arithmetic progression, no paper required:
(3,28),(2,20) (1,12),(0,4)
So 4 is the y-intercept.