Stage 8 - Q10 - 5 marks
18486
Challenge: a straight line contains \(\left(2,\ 7\right)\) and \(\left(5,\ 16\right)\). Find its equation, predict y at \(x=1.5\), and test whether \(\left(8,\ 25\right)\) is on it.
Hint
Use the change between the two points, then substitute one point.