Medium
Solve the pair of linear equations for x: 4x + 4y = 28 and 2x + -4y = 8.
Explanation
Explanation
Using the elimination method: multiply the first equation by -4 and the second by 4, then subtract to eliminate y. Solving gives x = 6 (and correspondingly y = 1). You can verify: 4(6) + 4(1) = 28 ✓ and 2(6) + -4(1) = 8 ✓.
PRO TIP
Re-check your working by substituting the answer back into the original question.