exam Maths Puzzle Numerical Ability

Please help me with understanding Cramer's rule. Could you be so kind as to solve this problem and explain each step also? I have to find the ordered pair by using Cramer's rule. T

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exam Other Question

Graph the function y=x and y=2 times the square root of x, on the same graph (by plotting points if necessary). Show the points of intersection fo these two graphs.
Graph:
Points of intersection: WHAT IS THE ANSWER TO
Y(3Y-8)(5Y+3)=0