2x – зу = -1
+ 3x+3y= 26
оа. бу = 25
ов. 5х = 27
ос. 5х = 25
od. 5x - бу = -27

C.

Step-by-step explanation:

Given:

Add the two equations, we get

Therefore, the correct option is option C.

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°