On a coordinate plane, a triangle has points R (negative 3, 4), T (negative 1, negative 4), and S (negative 4, negative 2). What are the coordinates of the image of vertex R after a reflection across the y-axis?

just took the test and my answers down below!

step-by-step explanation:

check the pic :

you can use a^2+ b^2=c^2

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