Remember that the slope of a line never changes so you can choose whatever 2 points you want and you will always get the same slope. F x 4 x 6 displaystyle f x4x6 Plug in Point for x. If the equation is not in this form try to rearrange the equation.
A more general way is to use the formula y2 - y1 x2 - x1 where y2 is a result of whatever expression you started with so here 100 dollars for 8 hours which means you could say 100 is one output.
Use the given slope for m the coefficient of x. Assuming youre talking about a linear straight-line equation you would use the standard slopey-intercept form y mx b. Slope y 2 y 1 x 2 x 1 text Slope. Remember that the slope of a line never changes so you can choose whatever 2 points you want and you will always get the same slope.