EQ006 · Equations & inequalities · Classes 9–12
Simultaneous Equations
Two equations solved together; the solution is where their lines meet.
Simultaneous Equations📐 Formula
m₁x + c₁ = m₂x + c₂ → x = (c₂ − c₁) ÷ (m₁ − m₂)
✏️ Worked example
y = −x + 4 and y = x: x = 2, y = 2.
🌍 Where it is used
Mixing problems, pricing and break-even analysis.
❓ Quick check
Parallel lines have how many common solutions?