Answer:

Explanation:
The equation of a line can be written in the form of y=mx +c, where m is the gradient and c is the y-intercept.

Using the gradient formula above,
gradient of line




Substitute m= ½ into the equation:
y= ½x +c
To find the value of c, substitute a pair of coordinates.
When x= 4, y= -1,

-1= 2 +c
c= -1 -2 (-2 on both sides)
c= -3
∴ The equation of the line is y= ½x -3.