Aconjecture and a portion of the flowchart proof used to prove the conjecture are shown. which equation best represents the information that should be in the box labeled 1? 2a + 4 = 20 2a = 20 4a + 4 = 20 4a = 10 flowchart proof. given segment x y is congruent to segment y z. x y equals 4 a plus 4. y z equals 20. prove that a equals 4. image given shows right triangle x y z with right angle y. side x y measurers 4 times a plus 4 and side y z measures 20. flowchart consisting of 5 rows of horizontal text boxes. a horizontal line segment joins the midpoints of each of the vertical sides of each of the text boxes effectively subdividing each text box into an upper box and lower box. in row 1 there are 3 textboxes. in the upper half of the box on the left is the equation x y equals 4 times a plus 4. in the lower half of the box is the word given. in the upper half of the box in the middle is the