Multiple Choice Question In a graph with output on the x-axis and dollar amount (for costs and revenues) on the y-axis, what will be the shapes of variable and fixed costs? Multiple choice question. Both variable and fixed costs will be parallel to the x-axis. Variable costs will be upward sloping while fixed costs will be parallel to the x-axis Variable costs will be upward sloping while the fixed costs will be parallel to the y-axis. Both variable and fixed costs will be upward sloping