The line t is a vertical line. When you reflect something across a vertical line, it retains the same vertical point but not the same horizontal point.
Like, reflecting (-5, 5) across the y-axis(in this case, the y-axis is named t) is: (5, 5).
So now do the same.
Q is 5 units left away from line t. So go 5 units right away from line t. R is 7 units left away from line t. So go 5 units right away from line t. S is 2 units left away from line t. So go 5 units right away from line t.
