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3x + y = 6,5
2x = 4y - 5
3x + y = 6,5 |*4
2x - 4y = -5
12x + 4y = 26
2x - 4y = -5
------------------ +
14x = 21 /:14
x = 1,5
y = 6,5 - 3 * 1,5 = 6,5 - 4,5
y = 2
{x = 1,5
{y = 2
b)
6x - 2y = 9
3x + y - 4,5 = 0
6x - 2y = 9
3x + y = 4,5 |*2
6x - 2y = 9
6x + 2y = 9
------------------- +
12x = 18 /:12
x = 1,5
y = 4,5 - 3 * 1,5 = 4,5 - 4,5
y = 0
{x = 1,5
{y = 0