Extract values Step 3. Y y 1 mx x 1 The equation is useful when we know. The slope of 3y 9x 12 is 3 because if we rearrange the formula to look like y mx b we get.
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.
Solving for Slope 1. Find the slope of the line that passes through the points -1 0 and 3 8. Back substitute the value of the slope and the solved value of the y -intercept into y mx b. One point on the line.