exam Maths Puzzle Numerical Ability

Could someone help me on this graph?

How do I plot the point with coordinates (-4,3).

Can you show me the graph? I have to send it through the computer, not on paper and t

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exam Other Question

the system equation

2^(5x+y)=0.25^(x-2y+3/2)
log(10,(x-y)=1/log(3,5)+log(3,2)

find {{{x}}},{{{y}}} I am stuck on these two problems and need some help

Simplify: square root of 7(5 square root5-3 square root 7)

and also
simplify: Square root 75a^2 over square root5

Thanks a million