exam Maths Puzzle Numerical Ability

Graph the equation and identify the y intercept

x+5y=10

Would this be 5?

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exam Other Question

Write as a sum of difference of logarithms of a and b. Assume that all variables represent positive real numbers.

log12 a^3b^12 One eighth of the square root of 7 less than a number is 2. What is the number?
I also need the proof for it.
Please and Thank You=)