So 50 per week+3 times number of sales represent s as number of sales pay=50+3s if you want pay to be at least 110 or pay<u><</u>110 so 110<u>></u>pay=50+3s 110<u>></u>50+3s treat as regular equation: do the saem to both sides so it will stay equal also isolate the s term
110<u>></u>50+3s subtract 50 from both sides 60<u>></u>3s divide both sides by 3 20<u>></u>s you must make at least 20 sales