Answer: 2z + 6
Step-by-step explanation: Distribute the 2 to z and 3.
Answer:
Step-by-step explanation:
First system: no solution, since the two lines are parallel; they never cross.
Second system: one solution
Third system: infinitely many solutions, since the second equation is a multiple of the first
Answer:
x>−3 or x<−7
Step-by-step explanation: