What is the coordinate point of this equation?

( -2, 2)  

Step-by-step explanation:

There are many ways to solve this system of equations, but for this one, I chose graphing. The picture for the graphs are shown below.

1) First, let's graph the first equation since it is already in slope-intercept form. By looking at it and using our knowledge of y = mx + b format (with m as the slope and b as the y-intercept), the slope is -2 and the y intercept is -2. Let's mark (0,-2) on our graph and use our slope of -2 to graph more points and draw a line.  

2) Next, let's transform the second equation into y = mx+b format so we can graph it easily. All we need to do is isolate y on the left side like so:

3) So, from our work in the previous step, we can do the same thing we did in step 1 and graph . Let's mark (0,1) on our graph and use the slope to graph more points and form a line.

4) So, now that we have our graph, we can see that it intersects at (-2,2), therefore that is our solution.

Please don't hesitate to ask any questions!

Hi!

Assuming the 9in is the radius, we would multiply it by 2, or add it to itself. We then get 18 in.

Hope this helps!