Question

For which value of p, has unique solution, 4x+py=-8 and 2x+2y=-2 ​

Answer 1

Answer:

-3

Step-by-step explanation:

4x + py = -8 and 2x + 2y = -2

4x + py = -8 ___________ (1)

2x + 2y = -2 ___________ (2)

Multiplying eq (2) by 2

2 ( 2x + 2y = -2)

4x + 4y = 4 ____________ (3)

Let's substraction eq (1) & eq (3)

4x + py = -8

+

-4x + -4y = -4

_______________

4p = -12

p = -12/4

p = -3