Question

Solve the following equations by cross multiplication method. [3] x + 2y + 5 = 0 and 5x + y –2 = 0

Answer 1

Answer:

2x+y−5=0

3x+2y−8=0

Using cross multiplication method, we get

b

1

c

2

−b

2

c

1

x

=

c

1

a

2

−c

2

a

1

y

=

a

1

b

2

−a

2

b

1

1

2

x

=

+1

y

=

1

1

So, x=2 and y=+1