At Martina's auto shop, it takes her 15 minutes to do an oil change and 18 minutes to do a tire change. Let x be the number of oil changes she does. Let y be the number of tire changes she does. Using the values and variables given, write an inequality describing how many oil changes and tire changes Martina can do in at most 3 hours ( 180 minutes).

• prestonshelton: Hello!
  
  You want to know how much she can do in 180 minutes
  
  She can do an oil change in 15 minutes
  
  She can do a tire change in 18 minutes
  
  Based on this information you can make the inequality
  
  [tex]15x + 18y \leq 180[/tex]
  
  The answer is [tex]15x + 18y \leq 180[/tex]
  
  Hope this helps!
• : 15x + 18y ≤ 180 
  
  It's at most 180 minutes so left side is 'less than or equal to 180'.