C=7a+2bC = 7a + 2bC=7a+2b
a=4a = 4a=4 b=−5b = -5b=−5
Work out the value of CCC.
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.