exam Maths Puzzle Numerical Ability

Write the equation of the line with slope -2 and y-intercept (0,0). Then graph the line. Is it y=-2x? Please help!

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A rectangular animal pen with area 1200 m^2 has one side along a barn. The other three sides are enclosed by 100 m of fencing. Find the dimensions of the pen. ONE NUMBER IS 12 MORE THAN ANOTHER. THE SUM OF THE SMALLER NUMBER AND TWICE THE LARGER NUMBER IS 39. FIND THE LARGER NYMBER.