27-y:25 points
Explanation
Step 1
Let y represents the points she scored in the second half
total = 27 points
we also know that
total poitns= points first half+points sencond half
replace
[tex]\begin{gathered} 27=\text{ points first half+y} \\ \text{now, subtrac y in both sides} \\ 27-y=\text{ Point first half} \end{gathered}[/tex]
therefore, the expression is
[tex]27-y[/tex]
Step 2
now, if she scored 2 poitns in the second half
let
y=2
now, replace
[tex]\begin{gathered} \text{ Points first half= 27-y=27-2=25} \\ so \\ \end{gathered}[/tex]
she scored 25 points in the first half
therefore, the answer is
27-y:25 points
I hope this helps you