How can you show that 1/3 and 4/12 are equivalent?

Solve: 3x+y=6 4x-2y=18 show all work !

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read