book Maths Puzzle Numerical Ability

Find two positive real numbers that differ by 1 and have a product of 1.

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book Other Question

I need the equation of the line with the given slope and y intercept. I can plot, but this is driving me crazy. These are two I need. Of course, I realize you can only answer on John wants to order a pizza with one topping, he can have either thin crust or regular crust, his topping choices are onions, pepperoni, mushrooms or sausage. How many different choices of pizza does John have.

Thanks.