Consider the following system of linear equations. 2x −z =−1 3y −z =3 4x +5y −3z =5 Solve the system by completing the steps below to produce a reduced row-echelon form. R1, R2, and R3 denote the first, second, and third rows, respectively. The arrow notation → stands for "replaces," where the expression on the left of the arrow replaces the expression on the right.

he has now walked a total of what?

if i know what this is maybe i can

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

i think its 7.6

if so your welcome