Medium
Solve the pair of linear equations for x: 3x + 2y = 0 and 3x + -3y = -30.
Explanation
Explanation
Using the elimination method: multiply the first equation by -3 and the second by 2, then subtract to eliminate y. Solving gives x = -4 (and correspondingly y = 6). You can verify: 3(-4) + 2(6) = 0 ✓ and 3(-4) + -3(6) = -30 ✓.
PRO TIP
Re-check your working by substituting the answer back into the original question.