Question

In the stimultaneous equations:px+ qy=5,qx+py=-10;p and q are constants .if x=1 and y=-2 is a solution of the equation find p and q

Answer 1

Answer:

p=-25/4

q=-5/2

Step-by-step explanation:

Put value of y into qy=5

ie. q(-2)=5

     -2q=5

        q=-5/2

now put value of x , y and q into qx+py=10

-5/2 - 2p =10

-5-4p/2=10

-5-4p=20

-4p=20+5

-4p=25

p= -25/4