Math, asked by pranita1657, 8 months ago

If 15x + 17y =21 and 17x + 15y = 11 then find the value of x + y and also x -y.

Answers

Answered by abhishek1890
0

Step-by-step explanation:

x+y=1

x-y=(-5)

is the answer for your question

Answered by pranjalbaghel5
0

Answer:

x + y = 1

x - y = -5

Step-by-step explanation:

1) 15x + 17y = 21

⇒ 15x = 21 - 17y

⇒ x = (21 -17y) / 15

2) 17x + 15y = 11

⇒ 17 * (21 - 17y / 15) + 15y = 11

\frac{357-289y}{15} + 15y = 11

⇒ 357 - 289y + 225y = 165

⇒ 357 - 165 = 289y - 225y

⇒ 192 = 64y

⇒ 192/64 = y

⇒ 3 = y

⇒ x = (21 - 17y) / 15

⇒ x = (21 - 17*3) / 15

⇒ x = (21 - 51) / 15

⇒ x = -30 / 15

⇒ x = -2

x + y = (- 2) + 3 = 1

x - y = (- 2) - (3) = -2 - 3 = -5

Similar questions