Practise the method.Example 1Solve 2x+y=14 and x−y=4. Find x.Show worked answerAnswer: 6Add the equations to eliminate y:3x=18x=6.Example 2Adult tickets cost $9 and child tickets cost $4. A group buys 7 tickets for $53. How many adult tickets were bought?Show worked answerAnswer: 5Let adults be x.Children =7−x.Solve 9x+4(7−x)=53;x=5.Example 3Solve 2x+y=10 and x−y=−1. Find x.Show worked answerAnswer: 3Add the equations to eliminate y:3x=9x=3.