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Step-by-step explanation:

-x + 5y - 7 = 0

-x + 5y = 7 (I)

4y - 10 = 5x

-10 = 5x - 4y

5x - 4y = -10 (II)

             -x + 5y = 7 (I)

             5x - 4y = -10 (II)

Multiply equation (I) by 5.

(I)*5     -5x + 25y = 35

(II)        5x -   4y    = -10    {Now add and x will be eliminates}

                  21y   = 25

y = 25/21

Substitute y value in Equation (I)

-x + 5*25/21 = 7

-x + 125/21 = 7

-x = 7 - (125/21)

-x = (147/21) - (125/21)

-x = (147-125)/21

-x = 22/21

x = -22/21

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.