Please help, me with this.

(01.02 LC)
Simplify -5 1/6 - (-8 1/2)
A= -13 2/3
B= -3 1/3
C= 3 1/3
D= 13 2/3

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.

Which expression is equivalent to -12(3x-3/4)