Question 763306
Slope of the line is 2.
Since f(1) = 3, (1,3) is a point on the line.

The equation for a line with slope m and which has a point (x1,y1) is

(y - y1) = m(x - x1)

Substituting for m, x1 and y1

(y - 3) = 2(x - 1)

y - 3 = 2x - 2 or y = 2x + 1

f(x) = 2x + 1

So f(2) = 2*2 + 1 = 5

:)