exam Maths Puzzle Numerical Ability

solve each system by elimination. check your answers.

-x-y-2z=4
-x+2y+z=1
-x+y-3z=11

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exam Other Question

Solve the system. Assume that a and b represent nonzero constants.

ax+by=6
ax-3by=4

The x value of the solution is: Glenn can row 7 mph in still water. If it takes him the same time to row 6 miles downstream as it takes to row 4 miles upstream, what is the rate of the crrent?