Question

solve by cross multiplication method
x+y=3
2x-y=0

Answer 1

Hope help you my answer....

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

2x-y=0..........(2)

By cross multiplication method----

Here, a1=1,b1=1,c1=-3

And a2=2,b2=-1,c2=0

Now, x/b1c2-b2c1 = y/c1a2-c2a1 = 1/a1b2-a2b1

: x/1*0-(-1)*(-3) = y/-3*2-0*1 = 1/1*(-1)-2*1

: x/0-3 = y/-6-0 = 1/-1-2

: x/-3 = y/-6 = 1/-3

Now, x/-3 = 1/-3

x = 1

And, y/-6 = 1/-3

y = 2

Hence, x=1 and y=2

Answer 2

Here you go !
Hope this helps out !!