xxwatermelondogexx
xxwatermelondogexx xxwatermelondogexx
  • 24-08-2020
  • Mathematics
contestada

8a + 12b = 92 6a – 4b = 4 -- a =? b = ?

Respuesta :

emmanuel4920
emmanuel4920 emmanuel4920
  • 24-08-2020

Answer:

a = 4 b = 5

Step-by-step explanation:

8a + 12b = 92......eqn 1

6a - 4b = 4......eqn 2

multiply eqn 2 by 3

18a - 12b = 12.....eqn 2

add eqn 1 and 2 to eliminate b

26a = 104

a = 4

put a = 4 into eqn 2

18(4) - 12b = 12

72 - 12b = 12

72 - 12 = 12b

60 = 12b

5 = b

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