Cho 2 ham so y = (k + 1)x + k(1), y = (2k - 1) - k(2) voi gia tri nao cua k thì độ thi ham so (1) va (2) la 2 duong thang song

Cho 2 ham so y=(k+1) x+k(1), y=(2k-1)- k(2) voi gia tri nao cua k thi

​do thi ham so (1) va (2) la 2 duong thang song

​do thi ham so (1) va (2) cat nhau tai goc toa do