Question

Sally invests $300 in a lawn mowing business to buy a mower and other supplies. she charges $20 for each lawn she mows. write an equation to show the amount of money she has earned (y), for any number of lawns mowed (x).

Answer 1

y=20x-300

it's -300 because she pays 300 for her supplies and mower.

Answer 2

y = 20x - 300

Explanation:

If Sally invested $300 in a lawn mowing business to buy a mower and other supplies, and charges $20 for each lawn she mows, the equation to show the amount of money she has earned for any number of lawns mowed would be this one:

y (amount of money earned by Sally) = 20x (number of lawns mowed) - 300 (fixed number, which is the initial investment, that cannot be counted as a benefit)

y = 20x - 300

So, for example, if Sally mowed 17 lawns, the equation would function as this:

y = 20.17 - 300

y = 340 - 300

y = 40

Sally earned $40, after substracting the value of the initial investment.