Answer:
It appears to be substitution
Step-by-step explanation:
I think you are talking about system of equations
-50 because if he owes 10 different people the same amount it would be -50 because he owes them money
Answer: y = -2|x| + 1
Step-by-step explanation: it is an absolute value function, y = |x|, moved up one. then we see that it has been flipped. it has also been vertically stretched by a factor of 2.