2c is a factor of both terms.
.. area = 2c(c+1)
Possible expressions for length and width are
1, 2, c, 2c, c+1, 2(c+1), c(c+1), 2c(c+1).
The equation is
y=-2(12)+15
the y intercept is b, therefore y, 15, is b
y =MX+b is slope intercept form
y=-2(12)+15
