Question

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

Answer 1

Apply the formula
\[y -y_{1} = m(x-x_{1})\]

where:
\[m\]is the slope of the curve

\[(x_{1}, y_{1})\] is your given point.
Substitute those numbers in and make y the subject.

Answer 2

It would be 6-y=21(x-5)

Answer 3

@Azteck

Answer 4

LHS is not quite correct. Please refer back to the formula I gave you compare the LHS of that formula to what you did on your LHS.

Answer 5

Remember:
\[y_{1}\]is the coordinate of your given point. Not y.

Answer 6

y-6=21(5-x)?? I don't understand:(

Answer 7

LHS means Left Hand side. sorry if I confused you with that. Your RHS (Right hand side) was correct before. Why did you change it?

Answer 8

so I had to change just the y? like this? y-6=21(x-5)