The work of a student to solve a set of equations is shown:
equation a: y = 15 – 2z
equation b: 3y = 3 – 4z
step 1:
–3(y) = –3(15 – 2z) [equation a is multiplied by –3.]
3y = 3 – 4z [equation b]
step 2:
–3y = 15 – 2z [equation a in step 1 is simplified.]
3y = 3 – 4z [equation b]
step 3:
0 = 18 – 6z [equations in step 2 are added.]
step 4:
6z = 18
step 5:
z = 3
in which step did the student first make an error? (5 points)
step 4
step 3
step 2
step 1

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.

Three consecutive integers have a sum of 234. what are the three integers

What graph represents an even function