Medium
Solve the pair of linear equations for x: 4x + 5y = 35 and 3x + -5y = 0.
Explanation
Explanation
Using the elimination method: multiply the first equation by -5 and the second by 5, then subtract to eliminate y. Solving gives x = 5 (and correspondingly y = 3). You can verify: 4(5) + 5(3) = 35 ✓ and 3(5) + -5(3) = 0 ✓.
PRO TIP
Re-check your working by substituting the answer back into the original question.