Question

Help to solve:

if x-2y=0 and -2x+y=2, then 3x-3y=

Answer 1

First equation is
`x-2y=0`

Second equation is
`-2x+y=2`

subtract equation (2) from (1),

`(x-2y)-(-2x+y)=0-2`

Distribute minus inside the paranthesis,

`x-2y+2x-y=-2`

Now combine the like terms,

`x+2x-2y-y=-2`

`3x-3y=-2`

Thus the value of
`3x-3y` is
`-2.`