Question

13 Sammy incorrectly solves the equation 1/3(x+9)=8 which step shows an error based on the equation only from the previous step? 1/3x+9=91/3x=8+91/3x=17x=17÷3x= 5 2/3

Answer 1

Solve the equation.

$\begin{gathered} \frac{1}{3}(x+9)=8 \\ \frac{1}{3}x+3=8 \\ \frac{1}{3}x=8-3 \\ x=5\cdot3 \\ =15 \end{gathered}$

The Sammy mistake is in in first step as he does not multiply the number 9 by 1/3.

So incorrect step is step A.