exam Maths Puzzle Numerical Ability

solve the following sytems of equations

1. 2. 3.
y=7x-8 6x+7y=19 3x-2y=4
y=3x-12 x+y=5 2x+y=12

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exam Other Question

8. What is the formula for the surface area of a cylinder? A function f(n) defined for all positive integers has the property that f(m)+ f(n) = f(mn) for any two positive integers m and n. If f(2) = 7 and f(3) = 10, then calculate f(12).