Question

if 15x + 17y = 21 and 17x + 15y =11 then find the value x + y =?​

Answer 1

Answer:

15x+17y=21-------eq 1

17x+15y=11-------eq 2

Adding eq 1 and 2

15x+17y=21

+17x+15y=11

__________

32x+32y=32

Dividing both side by 32

x+y=1

Answer 2

If 15x + 17y = 21 and 17x + 15y = 11 then the value of x + y = 1

Given :

15x + 17y = 21 and 17x + 15y = 11

To find :

The value of x + y

Solution :

Step 1 of 2 :

Write down the given system of equations

The given system of equations are

15x + 17y = 21 - - - - - (1)

17x + 15y = 11 - - - - - (2)

Step 2 of 2 :

Find the value of x + y

Adding Equation 1 and Equation 2 we get

15x + 17y + 17x + 15y = 21 + 11

⇒ 15x + 17x + 17y + 15y = 32

⇒ 32x + 32y = 32

⇒ 32( x + y ) = 32

⇒ x + y = 32/32

⇒ x + y = 1

The value of x + y = 1

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