reflection across the y-axis takes
(x,y) -> (-x,y)
so, just flip the signs of all the x-values.
The vertices of a triangle are P(–4, 1), Q(–2, –8), and R(8, –1). Name the vertices of the image reflected across the y-axis.
1.P'(–4, –1), Q'(–2, 8), R' (8, 1)
2.P'(4, –1), Q'(2, 8), R'(–8, 1)
3.P'(4, 1), Q'(2, 8), R'(–8, –1)
4.P'(–4, 1), Q'(–2, –8), R'(8, –1)
please help
1 answer