exam Maths Puzzle Numerical Ability

please solve the system
3x+4y=-2
x=-2y

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exam Other Question

You are told that a line has a slope of -3 / 4 and that the line passes through the point given by ( -2, 3 ). Choose two other points from those given below which are on this same line. Directions are to solve this problem: the area of a rectangle is 256 m^2. The length of the rectangle is 4 times greater than the width. What are the length and width of the rectangle? My answer to this was L=32 and W=8. Am i correct?