Question

11x-8y=27 3x+5y=-7 cross multiplcation​

Answer 1

Answer:

x = 1 ; y = -2

Step-by-step explanation:

G.T.,

11x - 8y = 27 ----------------- 1

3x + 5y = -7 ------------------ 2

When cross multiplied

-7 (11x - 8y) = 27 (3x + 5y)

-77x + 56y = 81x + 135 y

81x + 77x + 135y - 56y = 0

158x + 79y = 0 --------------- 3

Let us take the value of 'x' from 3

x = - 79y / 158

x = - y / 2 ----------------------- 4

We can use the value of 'x' in 1 or 2

Let us take in 2

3 ( -y / 2 ) + 5y = -7

-3y / 2 + 5y = -7

-3y + 10y / 2 = -7

7y = -14

y = -2 -------------------------- 5

Let us take the value of 'y' in 4

x = - (-2) / 2

x = 2 / 2

x = 1

Hence, we got the value of 'x' and 'y' as 1 and -2