Three consecutive integers have a sum of –21. Which equation can be used to find the value of the three numbers? x + x + x = negative 21
x + 2 x + 3 x = negative 21
x + (x + 1) + (x + 2) = negative 21
x + (x + 2) + (x + 4) = negative 21

What values of c and d make the equation true?

3. solve the given inequality and graph the solution on a number line.

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.