Subtracting linear expressions

 $\left(-2g+7\right)-\left(g+11\right)$  

•  $-3g+4$  

•  $-3g+-4$  

•  $g+18$  

•  $g+-18$  

 $\left(4-5y\right)-\left(2y-16\right)$  

•  $-3y+20$  

•  $-3y+-12$  

•  $7y+12$  

•  $-7y+20$  

 $\left(-\frac{1}{8}c+16\right)-\left(\frac{3}{8}+3c\right)$  

•  $-3\frac{1}{8}c+15\frac{5}{8}$  

•  $-\frac{1}{2}c+13$  

•  $\frac{1}{2}+13c$  

•  $-3\ \frac{1}{8}+15\ \frac{5}{8}c$  

 $\left(\frac{1}{3}-6m\right)-\left(\frac{1}{4}n-8\right)$  

•  $-6\ \frac{1}{4}mn+-7\frac{2}{3}\$  

•  $-6m+-\frac{1}{4}n+8\ \frac{1}{3}$  

•  $-6\ \frac{1}{4}mn+8\ \frac{1}{3}$  

•  $6m\ +-\frac{1}{4}n+8\ \frac{1}{3}$  

Your friend finds the difference (4m+9) - (2m-5).

=4m+9-2m-5

=4m-2m+9-5

=2m+4

Is your friend correct? Explain your reasoning

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