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Maths Puzzle
Numerical Ability
what is a expression
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How do I work out these problems 1x+1y=2 , -5x+1y=20 and -5/-7x+ 1y=-10/-7
to get these answers (-3,5), (-5,-5), and (2,0)?
use cramers rule to solve
5x-4y+z=17
x+y+z=4
-10x+8y-2z=11