$f\left(−2\right) = 5$ means $\left(−2,5\right)$ is a point on the line. Also, $\left(0,2\right)$ is a point on the line.

Graph the points on a set of axis, then draw the line.

To find the equation, make a slope triangle to find the slope and the y-intercept. Substitute these values into the equation of a line.