PLEASE ANSWER

Look at the graph of the system of equations: 5x-3y= -3 and x + 3y =21
How can you prove that the point of intersection of the lines on the graph is the solution to both equations?

A. Substitute 6 as the x value in each of the equations and solve for y.
B. Substitute 7 as the y value in each of the equations and solve for x
C. Substitute 3 as the x value in each of the equations and solve for y.
D. Substitute 1 as the y value in each of the equations and solve for x.

Determine if the following statement is true or false. the normal curve is symmetric about its​ mean, mu. choose the best answer below. a. the statement is false. the normal curve is not symmetric about its​ mean, because the mean is the balancing point of the graph of the distribution. the median is the point where​ 50% of the area under the distribution is to the left and​ 50% to the right.​ therefore, the normal curve could only be symmetric about its​ median, not about its mean. b. the statement is true. the normal curve is a symmetric distribution with one​ peak, which means the​ mean, median, and mode are all equal.​ therefore, the normal curve is symmetric about the​ mean, mu. c. the statement is false. the mean is the balancing point for the graph of a​ distribution, and​ therefore, it is impossible for any distribution to be symmetric about the mean. d. the statement is true. the mean is the balancing point for the graph of a​ distribution, and​ therefore, all distributions are symmetric about the mean.