Show your work solve the system3x-5y=-1 2x+7y=20

You can just do this on a calculator

Step 1: Solve 3x−5y=−1 for x
Add 5y to both sides
Divide both sides by 3
Substitute 5/3y + -1/3, for x.
Simplify both sides of the equation
Add 2/3 to both sides
Divide both sides by 3 and 1/3

Y=2 

Substitute 2 for y in x = 5/3y + -1/3
Simplify both sides of the equation

X=3

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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