Which of the following expressions are equivalent? A. –3(3x + 5) and –9x + 5
B. 7(6x – 1) and 42x – 7
C. –6(4x – 3) and –6x
D. 5(2x + 3y) and 25xy

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Find the solution of this system of equation -7x+y=-20 9x-3y=36

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2