Max sells lemonade for $3 per cup and candy for $2 per bar. He earns $450 selling lemonade and candy. If Max sold 90 bars of candy, how many cups of lemonade did he sell?

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.

thus, the first answer choice, y = sec x, is the correct one