What is the formula for y if you know x and other x,y coordinates?

Question

oaktree · Answer

What do you mean? Is it in a line, a parabola, a hyperbola, an ellipse...?

anonymous · Answer

I'm sure one could tell with the other 4 coordinates listed. They are -6,-36; -2,-20; 1,-8; and 8,20.

oaktree · Answer

Yeah, that's a line. You need to find the equation of the line through y=mx+b. The slope, m, is 4. You figure that out using $$m = \frac{ y_{2} - y_{1} }{ x_{2} - x_{1} }$$

oaktree · Answer

Then plug in an ordered pair (x,y) - of which you have four to choose from - and solve for b.

anonymous · Answer

Thank you! Thats what I was trying to remember but I forgot what it was called. I haven't taken Alg in forever!

oaktree · Answer

No problem.