①-②:9/4=-3a
3a=-9/4
a=-3/4
a=-(3/4)を①へ代入
5/4=-{-(3/4)}+b
-b=-{-(3/4)}-(5/4)
-b=(3/4)-(5/4)
-b=-1/2
b=1/2
①-②:9/4=-3a
3a=-9/4
a=-3/4
a=-(3/4)を①へ代入
5/4=-{-(3/4)}+b
-b=-{-(3/4)}-(5/4)
-b=(3/4)-(5/4)
-b=-1/2
b=1/2
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