Toán Lớp 7: cho hệ số y=|a+1|*x+3
a) tìm a biết khi x=2 thì y=3
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Toán Lớp 7: cho hệ số y=|a+1|*x+3
a) tìm a biết khi x=2 thì y=3
Comments ( 2 )
3=|a+1|*2+3
<=>2*|a+1|=0
<=>|a+1|=0
<=>a+1=0
<=>a=-1
Vậy : a=-1 thì x=2; y=3