Question

x+y=3 ,2X+5y=12 by direct method​

Answer 1

Answer:

x=1,y=2

Because:

x+y=3, y=3-x

Steps:

2X+5y=12

2x+5*(3-x)=12

2x+15-5x=12

2x-5x=12-15

3x=3

x=3/3

x=1

y=3-x=3-1=2

Answer 2

Answer:

x= 9 ; y= -6

Step-by-step explanation:

x+y=3 eq 1

,2X+5y=12 eq2

x=3-y.

putting value of x in eq 2

2( 3-y)+5y=12

6-6y+5y=12

-y=6

y=-6

putting value of y in eq 1

x-6=3

x=3+6

x=9