exam Maths Puzzle Numerical Ability

solve the system of equations:

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

using determinants

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exam Other Question

i need your help to solve this here it is

the attendance at a baseball game was 400 people. student tickets cost $2 and adult tickets cost $3.total ticket sales were $1050. how many tickets of each type were sold Solve the folling 2 x 2 systems using substitutions

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