we have that
The coordinates of the pre-image and the image of the triangle are
\(A(-1,4)----->A'(3,4)\)
\(B(-1,10)----->B'(3,10)\)
\(C(3,6)----->C'(7,6)\)
so
The rule of the translation is
\((x,y)-------> (x+4,y)\)
That means
The translation is \(4\) units to the right
therefore
the answer is
The translation is \(4\) units to the right
