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Cho dubng thang (d): y = ax + b. Xac dinh a, b biet:
1) (d) di qua goc toa do va // voi dubng thang y =- x + 5
2) (d) di qua diem A(2; 3) va (d) song song voi dubng thang y = 2x + 1
3) (d) di qua diem C(l; -2) va diem D(2; -3)
4) (d) cat true tung tai diem co tung do bang 2 va cat true hoanh tai diem co hoanh do bang 3
5) (d) song song voi dubng thang y =- 2x + 1 va di qua giao diem 2 dubng thang y =
x-5vay = 2x-4