>>12051780We can represent all straight lines on x, y grids with the formula y = m*x + C, where m is the gradient of the line (gradient is rise/run) and C is the y intercept (the place on the y axis where the line goes across the y axis).
So in this case we can see that m (the rise/run) is -1.5/3 (because the line goes down 1.5 for every 3 it goes across). Which we can also simplify as -1/2 (because 1.5 is half of 3).
So we have y = 1.5*x + C
So now we find C by observing that the line crosses the y axis at 3, so C is 3.
So the equation for the line is y = 1.5*x + 3.
