The answer would be number 4, y=3/4x-6.
This is because both of the equations share the same slope of 3/4x.
Step-by-step explanation:
hope you can understand
720 feet/ 3,600 seconds is your unit rate
You problem is you don't have any problem. You have a bunch of formulas for the perimeter and area of some shapes.
As for using the formulas, usually you're given all but one of the variables and you can solve for the remaining one.
Notice how the triangle result doesn't have area as a function of a, b and c. That's called Heron's formula and is usually not taught to secondary school students. I don't like to teach it either because Archimedes' Theorem is so much better:
The sides a,b,c and area S of a triangle satisfy