Question

Y=x+3
x-2y=-1

find x and y

Answer 1

`y=x+3` for x

Flip the equation:

`x+3=y`

Add -3 to both sides:

`x+3+-3=y+-3`

`\fbox{x = y - 3}`

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`x-2y=-1` for y

Add -x to both sides:

`x-2y+-x=-1+-x`

`-2y=-x-1`

Divide both sides by -2:

`(-2y)/(-2) =(-x-1)/(-2)`

`\fbox{y = $(1)/(2)x+ (1)/(2) $}`