Evaluate the following function for f(-1).f(x)=-6x+9

How do you solving the solution of each system using elimination?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?