How do I do linear functions?

The way I do it is with a graphing calculator. If you graph the function and it is a diagonal straight line going across the graph then it is linear. I forgot how to figure it out algebraically so maybe someone else can help you out with that.

I hope this helps :)

12/11c

or

12

c

11

y = 0.77(x)

step-by-step explanation:

the jacket retains this value after 23% cut or retains 77% of original value. plug original 87 jacket price for x and the remaining value should be y.