solve graphically

 x + 2y = 3

2x + 4y = 15

 2>We need to solve the given pair of simultaneously equation by using substitution method as-

x + 2y = 5 ......(1)

3x - 6y =15 ......(2)

Multiply equation 1 by 3 in order to get,

3x + 6y = 15 .......(3)

Adding equation 2 and 3 we get,

6x = 30

x = 5

y = 0