Acomputer salesperson earns a commission of $15 for every $100 in sales. use this ratio to complete the table of sales-based commissions.
sales ($) 100 200 300 400
commission ($) 15 75

For sales: $15/$100=X/$200, X=$15,30,45,60. For commission: $100/$15=Y/75, Y=$100, $500

Sales ($) 100 , 200 , 300 , 400, 500
Comission ($) 15 , 30 , 45 , 60 , 75

I think this is what you are looking for? Basically, all you do is use the ratio 100:15 to find out the amount of commission earned

There is no graph but what i can say is that 1 is the slope and that -2 is the y- intercept