Part A
The perimeter of a rectangle is given by
Perimeter = 2(length + width)
i.e. 2(x + y) = 24
x + y = 24 / 2 = 12
Therefore, the equation in standard form for the perimeter is given by
x + y = 12
Part B
x-intercept is x = 12
y-intercept is y = 12
The intercepts does not make sence as a solution for this equation because either side of a rectangle cannot be 0.