What is the perimeter of a rectangle with a length of 2x + 4 and a width of 4x?
Draw a picture as well.

I'll leave the picture to you; draw a rectangle and write 2x+4 along the length and 4x along the width.   We don't really know the aspect ratio of the rectangle until we know x so any rectangle is fine.

The perimeter is the sum of all four side lengths,

p = (2x + 4) + 4x + (2x + 4) + 4x

p = 12x + 8

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solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system