Question

Question content area top
Part 1
Error Analysis  The solution shown for the equation is incorrect. What is the correct​ solution? What is the​ error?
minus6​(2minus​r)
equals
18
minus12minus6r
equals
18
minus6r
equals
30
r
equals
minus5
Question content area bottom
Part 1
The solution is
  
5. ​(Type the value of​ r.)
Part 2
What is the​ error?
A.
The right side of the equation should be 5 after dividing each side by minus6.
B.
The left side of the equation should be minus12plus6r after distributing.
C.
The right side of the equation should be 6 after subtracting minus12 from each side.
D.
The left side of the equation should be minusr after dividing each side by minus6.

Answer 1

Part 1: r = 5

Part 2: B. When distributing, -6(2 − r) = −12 + 6r (not −12 − 6r). Thus −12 + 6r = 18 → 6r = 30 → r = 5.