Hello ! :) please help me with a for me to mark you brainlst :)

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3