Assume the price of product Y (the quantity of which is on the vertical axis) is R21 and the price of product X (the quantity of which is on the horizontal axis) is R23. Also assume that money income is R675. The absolute value of the slope of the resulting budget line:
The slope of the budget line can be calculated using the formula:
Slope = -(Price of X / Price of Y)
In this case, the price of X is R23 and the price of Y is R21, so:
Slope = -(R23 / R21) = -1.095
The absolute value of the slope of the budget line is therefore 1.095.