[Toán 9]Hàm số

N

nckn23

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V

vip_boy_hp_9x

a)vi dg thang y=ax+b// vs dg thang y=3x+2009 nen a=3
vi do thi cat diem A(-1;2)nen ta thay y=2;x=-1 vao cong thuc hs
ta co:2=3.-1+b
2=-3+b
b=5
vay ta co s y=3x+5
b)vi dg thang y=ax+b nen a=-1/2
vi do thi cat diem A(4;-3)nen ta thay y=-3;x=4 vao cong thuc hs
ta co:4=-1/2.4+b
4=-2+b
b=6
vay ta co hs y=-1/2x+6
 
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