Answer:
y = 0.5x + 2.5
Explanation:
equation of straight line is ) y – y1 = m (x – x1), where y1 and x1 are the coordinates of a given point, , and m is the slope (gradient).
slope (gradient) = (change in y values) ÷ (change in x values)
= (1 - 7) ÷ (-3 - 9)
= -6 ÷ -12
= +0.5.
let's pick one of the coordinates. I will pick (9,7).
y - 7 = 0.5(x - 9)
y - 7 = 0.5x - 4.5
y = 0.5x -4.5 + 7
y = 0.5x + 2.5