there were 508 people at a rock concert. Orchestra seats cost $25 per person and balcony seats cost $18. The amount sold totaled $11,223. Find the number of orchestra seats and the number of balcony seats sold for the concert.

211  balcony seats and 297  orchestra seats  

Step-by-step explanation:

x = Orchestra seats

y = Balcony seats

Total person at concert = 508

So      x + y = 508

Cost

Orchestra seat $25x

Balcony seats $18y

Total money $11,223

So $25x + $18y = $11,223

Solving      x + y = 508

              $25x + $18y = $11,223

Solving the first equation for x and substituting x into the second equation then solve for y.

x + y = 508

x = 508 - y    substituting x = 508 -y in second equation

25(508 - y) + 18y = 11,223

12700 - 25y + 18y = 11,223

12700 - 7y =     11223

-7y = 11223 - 12700

 -7y = -1477  

   y = -1477 ÷ -7

   y = 211  balcony seats

x + y = 508

x + 211 = 508

x = 508 - 211

x = 297  orchestra seats  

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950