3. Solve x and y (1) `3x + 12y = 0` (2) `x-3y = 10`


Hint
Answer
`x=-10/7` `y=40/7`
Show Steps
Form equation (1) we get `=>3x = -12y` `=>x = -4y` substitute `x` to equation (2): `=> -4y-3y=10` `=> -7y=10` `=> color(red)(y = -10/7)` Solve x: `=> x = -10/7times(-4)` `=> color(red)(x = 40/7)`