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