Number graph ranging from negative eight to eight on the x axis and negative eight to eight on the y axis. two lines that are perpendicular to each other intersect at (three, zero). the line with a positive slope is labeled a and the line with a negative slope is labeled b. use the graph to state the solution for the system. x – y = 3 (line a) x + y = 3 (line b) a. (0, 3) b. (–3, 0) c. (0, –3) d. (3, 0)

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

Ya i could just need to know what type of math