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4 = 3a + b *(-1)
6 = 7a + b
-3a - b = -4
7a + b = 6
---------------- +
4a = 2 /:4
a = 1/2 = 0,5
b = 4 - 3 * 0,5
b = 2,5
y = 0,5x + 2,5