book Maths Puzzle Numerical Ability

How solve the system 4x-6y=4 and x+5y=14 using Cramer's rule?

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book Other Question

A Low fat biscuit claims to be 85% fat-free. Each biscuit weighs 16g and the fat content weighs 2.2g.
(a) What is the percentage of fat in the biscuit?
(b) Is the 85% fat free c Find the slope of any line parallel to the line through points (14, 1) and (1, 2).