add three numbers to the following data set so that the mean and the median of the set increase to 42. the numbers in the data set are 25, 29, 31, 32, 33, 34, 35, 36, 37, 39, 39, 40, 41, 41, 41, 41 42, 43, 43, 45, 45, 46, 46, 46, 47, 47, 48, 49, 49, 50.

{3 + i, 3 - i, 3, -1}

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

cant open file sorry!

step-by-step explanation: