exam Maths Puzzle Numerical Ability

Solve the folling 2 x 2 systems using substitutions

y=3x -7
2x + 5y =16

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exam Other Question

solve the system of equations:

x+y+z=39
y+z+u=45
z+u+x=43
u+x+y=41

using determinants how would i write 8 squared 14 over 8 squared 12 as an expression using a single exponet?