What is the slope of the line in the graph?

Which of the following contains a variable?

Manuela claims that and are congruent. which statement best describes her claim? she is incorrect because the segments do not have the same orientation. she is incorrect because the segments do not have the same length. she is correct because the segments have the same length. she is correct because the segments have the same orientation.

Pls never taught i’m really confused and i rlly need