Question: Hello, I hope all is well. I need help solving some questions. Can you please help me? Solve each system of equations by using substitution

Hello, I hope all is well. I need help solving some questions. Can you please help me?

Solve each system of equations by using substitution

45. 91 + 3x = 18 -31-1=47. x - 16 - 96 7x+ 3y = 6849. -9c - 4d = 31 6c + 6d 2451. TENNIS At a park, there are 38 people playing tennis. Some are playing doubles, and some are playing singles. There are 13 matches in progress. A doubles match requires 4 players, and a singles match requires 2 players. a. Write a system of two equations that represents the number of singles and doubles matches going on. b. How many matches of each kind are in progress

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