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4y=8+3x
y=¾x+2
a=¾
prosta prtostopadła ma a=-⁴/₃
y=ax+b
y=-⁴/₃x+b
5=-⁴/₃×2+b
5=-⁸/₃x+b
b=5+⁸/₃
b=7⅔
równanie:
y=-⁴/₃x+2⅔