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1 sposób:
y=ax+b
5=-2a+b
3=a+b po skomplikowanych obliczeniach: a=-⅔ b=3⅔ więc
y=-⅔x+3⅔
2 sposób:
y-y1=(y2-y1)(x-x1)/(x2-x1)
y-5=(3-5)(x+2)/(1+2)
y=-⅔x-1⅓+5
y=-⅔x+3⅔