Question 255829
First, the gradient.
The x co-ord goes from 4 to 2 which is -2
The y co-ord goes from 3 to 4 which is +1
gradient is y/x = 1/-2 = -1/2.
The value of y when x = 0 will be 5 the point (0,5) known as the y intercept
The equstion is y = gradient x + y intercept
which is y = - 1/2x + 5