What is the y-intercept? (picture attached)

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.

Why is x= 4 a solution to the proportion 14/x 56/1 6