{y= 5x +3 y= x - 9 how do you solve it

Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

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