Medium
Solve the pair of linear equations for x: 2x + 1y = -4 and 2x + -2y = 2.
Explanation
Explanation
Using the elimination method: multiply the first equation by -2 and the second by 1, then subtract to eliminate y. Solving gives x = -1 (and correspondingly y = -2). You can verify: 2(-1) + 1(-2) = -4 ✓ and 2(-1) + -2(-2) = 2 ✓.
PRO TIP
Re-check your working by substituting the answer back into the original question.