book Maths Puzzle Numerical Ability

Write the equation of the line passing through (3, 7) and (6, 11).
I am not sure how to solve these types of problems. Please help.

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book Other Question

How do you change .78 repeating and .66 repeating into a fraction? Find three consecutive even integers such that 3 times the sum of the first two is 48 less than the third.