$\"\"$

Carmen earns for each pamphlet is $\"\"$ .

Let x be the number of pamphlets in each week and y be the total amount earned by Carmen in a week.

Carmen earns in a week is $\"\"$ .

Carmen earns for 300 pamphlets in a week is $\"\"$ . $\"\"$

The equation is $\"\"$ and Carmen earns for 300 pamphlets in a week is $\"\"$ .