The slope-intercept form is simply the way of writing the equation of a line so that the slope (steepness) and y-intercept (where the line crosses the vertical y-axis) are immediately apparent. Often, this form is called y = mx + b form.
The original price of the item is said to be 100 dollars. Now, it offers 15% discount. Let's solve for the dicounted price. => 15% = 0.15 Solution: => 300 * .15 => 45 dollars => 300 dollars - 45 => 255 dollars