Express x from first equation:
x = y - z - 1
Replace x with found value in second equation and solve it:
y - z - 1 + y + z = 5
2y - 1 = 5
2y = 6
y = 3
Replace x with found value in third equation:
y - z - 1 + y - z = -3
Replace y with found value in this equation and solve it:
3 - z -1 + 3 - z = -3
-2z = -3 - 3 + 1 - 3
-2z = -8
2z = 8
z = 4
Find x by replacing y and z in first equation and solving it:
x = y - z - 1
x = 3 - 4 - 1 = -2
So x = -2, y = 3, z = 4
Make each of these an improper fraction, which would be 7/2 and 4/3. You can multiply these to get 28 / 6, and then you simplify to get 14/3, and if you were trying to make it a mixed number, just do 4 2/3
Answer:
Original Price= $20
Sales Price= $20*0.80= $16
I'm not entirely sure about these, and the last one was tricky but i hope this helped.
Answer:
The answer is c because the five is throwing you off
