Question

please solve this question.​

Answer 1

Let's separate the eqs.

1. x + y = 8
2. x * a = 21
3. a * b = 9
4. y - b = 5

From eq 3

a = 9 / b

From eq 2

x = 21 / a

Put a = 9 / b

x = 21b / 9 = 7 b / 3

From eq 1

y = 8 - x

Put x = 7 b / 3

y = (24 - 7b) / 3

Put this in eq 4

(24 - 7b)/3 - b = 5

24 - 7b - 3b = 15

9 = 10b

b = 9 / 10 = 0.9

Put in eq3

a x 0.9 = 9

a = 10

Put in eq2

x * 10 = 21

x = 2.1

Put in eq1

2.1 + y = 8

y = 5.9

∴ 2.1 + 5.9 = 8

    x       -

   10 x 2.1 = 9

    =      =

   21     5

: Ans

Hope I helped