Explain why the two equations below have the same solutions.
x + 3y = −1
−2x − 6y = 2
a. the two equations have the same slope, so they have the same solutions.
b. the second equation is a multiple of the first equation, so they have the same solutions.
c. the graphs of the equations are parallel and do not intersect, so any solution of one is a solution of the other.
d. the lines are perpendicular, so they have the same solutions.

Two groups of students were asked how many hours they spent reading each day. the table below shows the numbers for each group: group a 1 2 1 1 3 3 2 2 3 group b 3 2 3 2 2 2 1 1 2 based on the table, which of the following is true? the interquartile range for group a students is 0.5 less than the interquartile range for group b students. the interquartile range for group a students is equal to the interquartile range for group b students. the interquartile range for group a employees is 0.5 more than to the interquartile range for group b students. the interquartile range for group a employees is 1 more than the interquartile range for group b students.