△def is reflected to form △d′e′f′ . the vertices of △def are d(−1, −1) , e(1, −1) , and f(−1, −6) . the vertices of △p′q′r′ are d′(−1, 1) , e′(1, 1) , and f′(−1, 6) . which reflection results in the transformation of△defto△d′e′f′ ? reflection across the x-axis reflection across the y-axis reflection across y = x reflection across y=−x