abellis2005 abellis2005
  • 22-05-2022
  • Mathematics
contestada

can someone please help me this this??

can someone please help me this this class=

Respuesta :

jimthompson5910 jimthompson5910
  • 22-05-2022

Answers:

bio = 258

sociology = 169

============================================================

Work Shown:

x = number of bio textbooks

y = number of sociology textbooks

x+y = 427 books sold total

y = x-89 since 89 less sociology textbooks were sold compared to bio

Apply substitution to get the following

x+y = 427

x+x-89 = 427 ... replace y with x-89

2x-89 = 427

2x = 427+89

2x = 516

x = 516/2

x = 258 bio textbooks were sold

y = x-89

y = 258-89

y = 169 sociology textbooks were sold

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