Y = mx + b slope(m) = 3/2 (5,9)...x = 5 and y = 9 now we sub and find b, the y int 9 = 3/2(5) + b 9 = 15/2 + b 9 - 15/2 = b 18/2 - 15/2 = b 3/2 = b so ur equation is : y = 3/2x + 3/2.........(3,a)....so x = 3
15²-9²= x² use Pythagoras' theorum and square the two smaller sides to get the square of the hypotenuse (the diagonal) then rearrange this to get the above calculation
