Please somebody help me. Im really confused

Step-by-step explanation:

2.5y=5x-5

hence:

5x=2.5y+5

x=(2.5y+5)/5

take one of the values and plug it to another:

2.5y=5(2.5y+5)/5 -5

2.5y=2.5y+5-5

2.5y=2.5y

2.5y-2.5y=0

y is R (real number)

but im not sure

(x3 + 6x2 + 2x - 6) • (x - 1)

step-by-step explanation:

polynomial long division :

3.2     polynomial long division

dividing :   x4+5x3-4x2-8x+6

                              ("dividend")

by         :     x-1     ("divisor")

dividend     x4   +   5x3   -   4x2   -   8x   +   6

- divisor   * x3     x4   -   x3            

remainder         6x3   -   4x2   -   8x   +   6

- divisor   * 6x2         6x3   -   6x2        

remainder             2x2   -   8x   +   6

- divisor   * 2x1             2x2   -   2x    

remainder               -   6x   +   6

- divisor   * -6x0               -   6x   +   6

remainder                     0

quotient :   x3+6x2+2x-6   remainder:   0