The following proof shows an equivalent system of equations created from another system of equations. fill in the missing reason in the proof.

statements reasons
2x + 2y = 14
−x + y = 5 given
2x + 2y = 14
y = x + 5 ?

Umm.. just started this 2day and its not on my notes(p′︵‵。)

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

In the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? segment ad bisects angle cab. triangle acd is similar to triangle abd. segment ad is congruent to segment ac. angle cab is congruent to angle cba.