Question

if 3a+5b= 10 and 5a+-3b =30 ,what is the average of a and b​

Answer 1

Answer:

3a + 5b = 10

5a + 3b = 30

a + b = 5

(a + b)/2 = 5/2

(3a + 5b = 10

5a + 3b = 30

9a + 15b = 30

25a + 15b = 150

16a = 120

a = 15/2

b = -5/2

The arithmetic mean of a and b is 5/2.

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