Question

for what value of 'p' does the pair of equations given below has unique solution 4x+py+8=0 and 2x+2y+2=0

Answer 1

4x +py+8=0  _(i)
2x+2y+2=o_(ii)

take eq(ii)  2x+2y+2=0
                   ⇒2x=-2y-2
                   ⇒x=-2y-2÷2
                   ⇒x=-y-1
      
         now 2(-y-1)+2y+2=0
                 ⇒-2y-2+2y+2=o

p=0