Which expression is equivilent to 9x-3y-5x+7y+x+y. a=5x2+ 4y2. b= 10xy. c= 5x+5y. d= 4x +4y

5 (y + x) or c: 5x+y

Step-by-step explanation:

Simplify the following:

9 x - 3 y - 5 x + 7 y + x + y

Grouping like terms, 9 x - 3 y - 5 x + 7 y + x + y = (-3 y + 7 y + y) + (9 x - 5 x + x):

(-3 y + 7 y + y) + (9 x - 5 x + x)

-3 y + 7 y + y = 5 y:

5 y + (9 x - 5 x + x)

9 x - 5 x + x = 5 x:

5 y + 5 x

Factor 5 out of 5 y + 5 x:

 5 (y + x)

18a

step-by-step explanation:

simply because it is. it's the highest common factor

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)