Question 925419
(6, 16) and 
(7, 18)  m ={{{(y[1] - y[2])/(x[1] - x[2] )}}} =  -2/-1 = 2
***Using point-slope form, {{{y - y[1] = m(x - x[1])}}}P(6,16)
y -16 = 2(x - 6)
y - 16 = 2x - 12
y = 2x + 4
f(x) = 2x + 4