Solving a pair of linear equations

Proved

WorkbookSource.problem_16025

by wamlart · Sep 12, 2026 · Mathlib 0df444a (Lean v4.33.1)

lean-workbooksource-checked

Find the value of $x$ in the system of equations: $2x + y = 5$ $x - y = 1$

Source: InternLM Lean-Workbook, record lean_workbook_16025 (Apache-2.0). The complete source proposition and explicit variable declarations are preserved.

Preamble

import Mathlib
open Real Nat

Formal statement

theorem WorkbookSource.problem_16025 (x y : ℝ) (h₁ : 2*x + y = 5) (h₂ : x - y = 1) : x = 2 ∧ y = 1  :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_16025; Apache-2.0

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