Which situation can be represented by y = 20x? Prairie City had y inches of rain over 20 plus x days.

A bakery makes y pies from 20 pounds of apples sold for x dollars.

Juan is 20 years old. This is y years older than who is brother who is x years old.

Susie makes 20 blankets each month. This means she makes y blankets in x months.

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!