exam Maths Puzzle Numerical Ability

How do I solve using two equations with two variables?

The units digit of a two-digit number is 4 times the tens digit. If the digits are reversed, the new number is 54 more than the original number. Find the number.

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exam Other Question

I need to solve this quadratic equation:
x^2 � 3x = -6x � 1 the degree three polynomial f(X) with real coefficients and leading coefficient 1, has 4 and 3+ i among roots. express f(X)as a product of linear and quardratic olynomials with real coefficients.