7. At a fall festival, a student council sold two types of drinks: hot chocolate and apple cider. The student council earned $2 for every cup of hot chocolate it sold and $1 for every cup of apple cider it sold. There were
375 cups of drinks sold, and the total amount of money earned from selling drinks were $400.
The system of equations shown can be used to represent the situation.
x + y = 375
2x + y = 400

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!

you would need to know all the numbers that are on there

step-by-step explanation:

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: