exam Maths Puzzle Numerical Ability

If triangle TUV has coordinates T(1,1) U(2,5)V(0,4)
Find the coordinates of the vertices of triangle TUV after a 90 degree clockwise rotation.

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exam Other Question

I typed the equation wrong!!!!!!!!!

This is what it should have been

2x -4y =8
x - 2y = 4

thanks,

dnn
Trying my best to get a better understanding of solving linear systems but I have a long way to go. I need step by step examples to follow. -
solve the linear system without using matrices or determinants

x+y+z=2
x-y+3z=12
2x+5y+2z=-2