Find an equation equivalent to r = 1 + 2 sine in rectangular coordinates

Matt and brian were solving a system of equations. they both noticed that the two lines had the same slope. brian said that because each line in the system had the same slope, the two lines had to be parallel, which meant the solution to the system was "no solution" matt disagreed, and said they should also look at the y-intercepts before determining how many solutions there were. who is correct?

Brent wants to know what is 5 x 1/2

What is the average rate of change for this function for the interval from x=2 to x=4 ?