Question

solve x and y graphically 3x+y-12=0, x-3y+6=0​

Answer 1

Answer:

given :

3x+y-12=0

3x= -y+12.......(1)

given other equation:

x-3y+6=0

x=3y-6 (multiply 3 on both sides)

3x=9y-18........(2)

from both (1) and (2)

-y+12=9y-18

9y+y=12+18

10y=30

y=3

now substitute y=3 in (1)

3x=12-y

3x=12-3

3x=9

x=3

Now we have x=3 and y=3

coordinate point meet at ( 3 , 3 )