Answer:
[tex]y=100x+1200[/tex]
Step-by-step explanation:
Its given that for each set of knifes justin gets 100 dollars.
Also given that ,1200 dollars is guaranteed amount which he will get.
Hence if he sells x knifes then amount he would get by selling them alone would be [tex]100x[/tex] dollars.
Now the total amount would be added with 1200 dollars which he will get.
Hence equation for total amount would be
[tex]y=100x+1200[/tex]