book Maths Puzzle Numerical Ability

We are doing these questions in math class and i am so lost especially that its a spanish class and my teacher only speaks spanish so i don't know how to ask him because i don't sp

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Use Cramers Rule to solve the system of linear equation

3x+5y=17
x+3y=15
Each day a yourg person should sleep 8 hours plus 1/4 hour for each year the person is under 18 years of age. Write the equation relating hours of sleep y to age x, for 6 is less t