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1=1a+b
-7=3a+b obustronnie mnożymy -4
1=1a+b
7=-3a-b to wszytsko trzeba dodać
8=-2a
-4=a
1=1*(-4)+b
1=-4+b
b=5
y=-4x+5
-7=3a+b
a=1-b
-7=3(1-b)+b
-10=-2b /-2
b=5
a=1-b
a=-4
y=-4x+5