Which polynomial correctly combines the like terms and expresses the given polynomial in standard form?

9xy^3 - 4y^4 - 10x^2y^2 + x^3y + 3x^4 + 2x^2y^2 -9y^4

a. -13y^4 + 3x^4 - 8x^2y^2 + x^3y + 9xy^3

b. -13y^4 + x^3y - 8x^2y^2 + 9xy^3 +3x^4

c. 3x^4 - 8x^2y^2 + x^3y + 9xy^3 - 13y^4

d. 3x^4 + x^3y - 8x^2y^2 + 9xy^3 - 13y^4

Count the rise and run to find the slope, 1. Next, find the y-intercept-(-1). Now make the slope-intercept equation-  y = 1x - 1. Double check, put x = 2 in the equation-  y = 1(2) - 1 (=) y = 2 - 1 (=) y = 1.

So, the slope-intercept equation for this line is y = 1x - 1.