one variable and systems of equations in two variables · 第 22 题

one variable and systems of equations in two variables · 原库模块 1 · Q22 原库参考解析

y = x² + 2x + 1
x + y + 1 = 0
If (x₁ , y₁) and (x₂ , y₂) are the two solutions to the system of equations above, what is the value of y₁ + y₂?

解题思路