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K: y = ax + b
a = 5
y = 5x + b
-2 = 5*1 +b
b = -7
y = 5x - 7
2.
3. S(3,-1)
4. y = ax + b
1 = a + b
4 = 3a + b
b = 1-a
4 = 3a + 1 - a
2a = 3
a = 1,5
b = 1 - 1,5 = 0,5
y = 1,5x + 0,5
a₁*a₂ = -1
1,5 * a₂ = -1
a₂ = -²/₃
5.