Question

6. What is the value of k, if the value of Dy, for the equations 3x +y=1 and 2x — ky=3 is 7?​

Answer 1

Value of k is (- 1).

Correct question:

What is the value of 'k' if the value of y for the equations 3x + y = 1 and 2x - ky = 3 is 7?

Step-by-step explanation:

Here the given equations are

3x + y = 1 ... ... (1)

2x - ky = 3 ... ... (2]

When y = 7, from (1) and (2), we obtain

3x + 7 = 1 ... ... (3)

2x - 7k = 3 ... ... (4)

From (3), we have

3x = 1 - 7

➜ 3x = - 6

➜ x = - 2

Putting x = - 2 in (4), we get

2 (- 2) - 7k = 3

➜ - 4 - 7k = 3

➜ - 7k = 3 + 4

➜ - 7k = 7

➜ 7k = - 7

➜ k = - 1

Thus the value of k is (- 1).

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