Question

Find x & y if two regression lines are 2x+7y=43, 3x+5y-4​

Answer 1

Answer:

2x+7y=43-(1)

3x+5y=4-(2)

Step-by-step explanation:

EQ. 1 will be multiple by 3

EQ. 2 will be multiple by 2

6x+21y=129-(3)

6x+10y=8. -(4)

Eq. 3 will be subtract from Eq. 4

6x+10y=8

6x+21y=129

- - = -

-11y = -121

y = -121/-11

y = 11

put y =11 in Eq. 2

3x+5y=4

3x+5(11)=4

3x+55=4

3x=4-55

3x= -51

x=-51/3

x= -27