Question

Given the point (5, 6) and the slope of 5, find y when x = 21.

Answer 1

let's find the equation of the line first, then we can get y for any x

can you find the equation ?

Answer 2

y=5(21)+b
??

Answer 3

yeah that's what you have to do to find y at x=21

but first you have to find the equation passing by (5,6) and of slope 5

Answer 4

no idea lol

Answer 5

apply same formula as previous question

y - y1 = m( x - x1)

Answer 6

y-6=5(x-5)

Answer 7

correct
now can you simplify it ?

Answer 8

y-6=5x-25
y=5x-31