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4=-3a+b ==>b=4+3a
6=2a+b
podstawiasz b do drugiego
6=2a+4+3a
a=2/5 ... b=4+3a=5 i 1/5
B=(2,6)
y=ax+b
a= y2-y1/x2-x1
a=6-4/2- (-3)
a=2/5
y=2/5x+b
6=2/5*2+b
6=4/5 +b
6-4/5=b
b=30/5 - 4/5
b= 26/5
y=2/5x + 5 1/5