exam Maths Puzzle Numerical Ability

x+5y=10
-2x-10y= -20

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exam Other Question

Solve the equation

48. On a train, it took 3/4 hour to travel a distance of 52 1/2 miles. What was the average speed of the train?

Any help with this equation would be Greatly</b> appreciated. i need to solve -2x+y+z=-2
5x+3y+3z=71
4x-2y-3z=1

i have to solve for x,y, and z PLEASE HELP!!!!