exam Maths Puzzle Numerical Ability

solve the sytem of equations using the echelon method

2x + y + z=9
-x-y+z = 1
3x - y + z = 9

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exam Other Question

Any help will be appreciated with the following.

Find the slope and the intercepts of each line.

g(x)=54x-1
The length of a rectangle is three times the width. If the length is increased by 4 feet and the width is decreased by 1 foot, the area will be increased by 24 square feet. What are the dimensions of the original rectangle?