A rectangle has a length of x and a width of 5x +4 - x2. Find the perimeter of the rectangle when the length is 5 feet.
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To find a linear question, we must have two points on the line and we must know the slope.
Let us choose two points at random:
(-6,12) and (-5,14)
Now let us find the slope of the linear line:
So the slope is 2.
Now let us set up the equation which now requires only one point and the slope
let us use the point (-6,12) and the slope of 2
So the linear line is y = 2x + 4.
Hope that helps!