exam Maths Puzzle Numerical Ability

I am struggling with intercepts. Can you help me to find intercepts for x+y=56
and y=3x? These are examples of the problems I am trying to solve but am struggling with. Thank you.

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exam Other Question

In 1975 the population of the Earth was approximately 4 billion and doubling every 35 years. The formula for the population P in year Y for this doubling rate is
P (in billions) =
I do not understand the fromula that I must use to solve the equation. My teacher has failed to explain it to me. I was no there for the notes and there are none to copy because he