p तथा q के वे मान ज्ञात कीजिए जिसके लिए निम्न समीकरण युग्म के अनंत हल हों :
`2x+3y=7`
`(p+q)x+(2p-q)y=21`

{:(2x + 3y = 9),((p + q)x + (2p - q)y = 3(p + q+ 1)):}

Show that: |x p q p x q q q x|=(x-p)(x^2+p x-2q^2)dot

Show that: x p q p x q q q xx-p)(x^2+p x-2q^2) .

Find the values of p and q for which the following system of equations has infinite number of solutions: 2x+3y=7,quad (p+q)x+(2p-q)y=21