Hoặc
c) 2x+5y−8=03x+2y−1=0
c) 2x+5y−8=03x+2y−1=0⇔2x+5y=83x+2y=1⇔6x+15y=24−6x−4y=−2⇔2x+5y=8y=2⇔x=−1y=2
Vậy (x = -1; y = 2)