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$2x - y = 7$ and $4x - 2y = 10$

$y = x + 2$ and $y = -x + 4$

$3x - y = 0$ and $x + 2y = 12$

$4y = 8x$ and $y = 2x - 1$

$5x - 3y = 15$ and $x - y = -3$

$y = 2x + 4$ and $y = x - 1$

$2x + 5y = 20$ and $5x + 2y = 25$

$7y - x = 14$ and $3x - 21y = -42$

$y = 3x + 1$ and $3y - 9x = 3$

$y + 6 = 3x$ and $2y + 12 = 6x$

$x + 4y = 12$ and $-3x + 12y = 9$

$x + 3y = 9$ and $2x + 6y = 18$

$4y - x = 8$ and $2x + y = 7$

$2x - 3y = 6$ and $x + y = 4$

$y = -3x + 9$ and $y = 2x + 3$

$y = 4x - 1$ and $2y = 8x - 2$

$6x - 9y = 12$ and $y = -2x + 6$

$y = -4x + 8$ and $y = 0.5x - 1$

$y = 5$ and $y = -2x + 5$