will mark brainliest lol

Answer:
C) Complementary, x = 12
Step-by-step explanation:
This angles are complementary because they add up to 90 (because of the square in the corner)
4x + 1 + 4x - 7 = 90
8x - 6 = 90
8x = 90 + 6
8x = 96
x = 12
Answer:
complementary; x=12
Step-by-step explanation:
two angles who form a right angle (90°) are complementary. so,
90° would equal those two angle measures added together. make an equation then simplify.
90 = (4x+1) +(4x-7)
90 = 8x - 6
+6 +6
96 = 8x
÷8 ÷8
x = 12