The sum of two numbers, x and y, is 12. the difference of four times the larger number and two times the smaller number is 18. which system of equations should you use to find the two numbers? a x – y = 12 4x – 2y = 18 b x + y = 12 x – y = 18 c x + y = 12 2x – 4y = 18 d x + y = 12 4x – 2y = 18

Suppose you want to transform the graph of the function y=tan(x+pi/4)-1 into the graph of the function y=-tan(x+pi/2)+1 which transformations should you perform. a) reflect the graph of the first function across the x-axis, translate it pi/4 units to the left, and translate it 2 units up. b) reflect the graph of the first function across the x-axis, translate it pi/4 units to the right, and translate it 2 units up. c) reflect the graph of the first function across the line y = -1, translate it pi/4 units to the left, and translate it 2 units up. d) reflect the graph of the first function across the line y = -1, translate it pi/4 units to the right, and translate it 2 units up.