Mathematics for IGCSE & O level - Equations (Section 4 - No. 32)
Solve for x: 2x + y = 7 and 3x - y = 3
x = 2, y = 3
x = 3, y = 1
x = 1, y = 5
x = 4, y = -1
คำอธิบาย
Add the two equations together: 5x = 10, so x = 2. Substitute x back into either equation to find y = 3.