How do you solve and answer

17x+7°+9x+5°=90°

26x+12°=90°

26x=78°

x=3

17x+7°=y

17(3)+7°=y

51+7°=y

58°=y

the answer to that is the second one

Explanation:

x=3, y=58

9(3)+5=32

17(3)+7=58

32+58=90, since it obviously looks like a right angle,

then for y=58, it is because the 17x+7 is the same as y, and since the 17x+7 is equals to 58, then the value of y is 58 as well.

the answer is c i just put d and i got it wrong so yeah its d

i really need to know