c) 2x + 5y - 8 = 0 và 3x + 2y - 1 = 0
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)