90 = 12y - 30
As a real world problem ?

hope this is okay

Step-by-step explanation:

Joanne bought 12 tickets for 90 dollars. Because of a coupon, she got 30 dollars off. How much did each ticket cost? Write an equation where y is the cost of each ticket.

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb