CGPET 2019 Solved Paper

∵ Regression lines passes through the (x,y).
∴4x+3y+7=0 .......(i)
3x+4y+8=0 .......(ii)
Eq. (i) multiplying by 4 and Eq. (ii) multiplying by 3 and Eq. (ii) subtract from Eq. (i), we get
16x+28−(9x+24)=0
7x+4=0
x=−

4

7

Value of x, put the Eq. (i), we get
4(−

4

7

)+3y+7=0
⇒3y=−7+

16

7

⇒y=−

33

7

×

1

3

=−

11

7