exam Maths Puzzle Numerical Ability

x=2y-7
y-3x=-9

2x+5y=12
x-6y=-11

x+y=6
3x-3y=13

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exam Other Question

What is Youngs rule and what is the equation? Please help me solve

f(5) + h (5)

if
f(x)=7x - 40
h(x)= -x^2 + 6x