27(a)Algebraic Expressions FormulaeMedium1 markA teacher asks a student to make x the subject of the formula y=5x+2. Their working is shown in the box below, but it is not correct.line A: y=5x+2line B: 5y=x+2line C: 5y−2=xline D: x=5y−2Complete this statement.ALine A is not correct because x should be on the left-hand side.BLine B is not correct because y should have been divided by 5.CLine C is not correct because 2 should have been added to 5y.DLine D is not correct because x and 5y−2 should not be swapped.ELine B is not correct because the 2 should also have been multiplied by 5.FLine C is not correct because the 2 should also have been multiplied by 5.GLine D is not correct because 5y should have been divided by 5.HLine B is not correct because 5 should have been added to both sides.Grade answerSolutionGrading criteria
27(b)Algebraic Expressions FormulaeEasy1 markMake p the subject of the formula. A=pt2p =AtABAt2C2tADt2AEA−t2FtAG(tA)2Grade answerGrading criteria