book Maths Puzzle Numerical Ability

How do you calculate slopes in Algebra?

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Help Please! I've been working on this for hours and I can't seem to get it.

Bus leaves for vegas 1t 5 PM, distance is 270 miles

Next day bus leaves for same trip, but late, I am having trouble solving this problem. Any help will be greatly appreicated.

square root symbol x-7 - square root symbol x = -1