book Maths Puzzle Numerical Ability

-4X+Y=9 REWRITE THE EQUATION SO THAT Y IS A FUNCTION OF X

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book Other Question

I have to find all the values of b in the following equation that will give one or more real number solutions. Can you please help me with this?

3x^2 + bx - 3 = 0

Thanks! Five times a number subtracted from 3 times the number equals 20. Find the number.