Y = -3. Solved using elimination, although I've never seen the matrix tool before.
Answer: 
Step-by-step explanation:
multiply these -3/7 times by 3/8: Answer is -9/56
***If you found my answer helpful, please give me the brainliest, please give a nice rating, and the thanks ( heart icon :) ***
The answer is 1 25/56
I hope this helps!
Answer:
45
Step-by-step explanation:
all angles have to add up to a total of 360, so the other 3 angles equal 270 and there's two more angles that need to split 90° equally