Graphing form for linear equations in 2 variables.
3x+4y=0

i just need the x-intercept and y-intercept. i think i solved it as 0,0 for both x and y intercepts but i do not know if that is the answer or if there is another formula i need to use other than the ax+by=c.

Sport City has the better deal

Step-by-step explanation:

At Sport City, the cost of the tennis racket would be:

180  ⋅  0.85 = $ 153

(I used 0.85 instead of 0.15 because 0.15 is finding the discount amount, not the actual amount after the discount. Got 0.85 by subtracting 0.15 from 1.)

At Tennis World, the cost of the tennis racket would be:

$ 200 ⋅  0.80 = $ 160

(I used 0.80 instead of 0.20 because 0.20 is finding the discount amount, not the actual amount after the discount. Got 0.80 by subtracting 0.20 from 1.)

Sport City has the better deal because after the discount it is selling the racket for  

$ 153

, while Tennis World is selling it for  

$ 160

. Tennis World is selling it for  

$ 7

more than Sport City.