Practise the method.Example 1Evaluate 5x+2 when x=2.Show worked answerAnswer: 12Substitute 2.5×2+2=12.Example 2Evaluate 6x+5y when x=8 and y=2.Show worked answerAnswer: 58Substitute both values.6×8+5×2=58.Example 3Evaluate 7x+3 when x=3.Show worked answerAnswer: 24Substitute 3.7×3+3=24.