X=a−3bX = a - 3bX=a−3b
a=−6a = -6a=−6 b=−4b = -4b=−4
Work out the value of XXX.
Practise OCR GCSE Maths Substitution with exam-style questions for Foundation and Higher tier. 100 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.