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Answer:
y=4,x=1
Step-by-step explanation:
4x+y=8
x+y=5
subtract equation 2 from equation 1
3x + 0=3
3x=3
divide both sides by 3
x=1
substitute for x=1 in equation 2
x+y=5
1+y=5
y=5-1(collecting like terms)
y=4
The reason why it is equal is because when you divide you are really subtracting so 10^15-10^4 so 15-4 equals 11
Four and five are finding exterior angles while seven and eight are finding interior.
exterior angles= 360/n(# of angles)
interior angles= 180*(n-2)
