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2. Solve x and y
(1) `3x + 12y = 0`
(2) `x+3y = 10`
2. Solve x and y
(1) 3x + 12y = 0
(2) x+3y = 10 `x=40`
`y=-10`
Form equation (1) we get
`=>3x = -12y`
`=>x = -4y`
substitute `x` to equation (2):
`=> -4y+3y=10`
`=> -y=10`
`=> color(red)(y = -10)`
Solve x:
`=> x = -4times(-10)`
`=> color(red)(x = 40)`
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