book Maths Puzzle Numerical Ability

use cramer's rule to solve the following system of equations.
5x+3y=7
4x+5y=3

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book Other Question

A price increased from $78 to $104. What is the percent of increase?
Is it 33.3 % ?
Thanks solve the equation. Label solution as real, imaginary, and/or complex.

x^2 - 2x + 5=0