$\to A + \to B$ $vecA + vecB$

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\to A + \to B = (x_{a} + x_{b}, y_{a} + y_{b})

$vecA + vecB = ( x_a + x_b , y_a + y_b )$

(x_{a}) X component of vector A

$(x_a)"X component of vector A"$

(y_{a}) Y component of vector A

$(y_a)"Y component of vector A"$

(x_{b}) X component of the vector B

$(x_b)"X component of the vector B"$

(y_{b}) Y component of the vector B

$(y_b)"Y component of the vector B"$

Reference

This formula is used in Light and Matter by Benjamin Crowell, Chapter 7.3