3x + 3y + 6z = 9
2x + 1y + 3z = 7 ⇒ 6x + 6y + 8z = 6
1x + 2y - 1z = -10 6x + 6y + 8z = 6
4z = 12
3x + 3y + 6z = 9 4 4
2x + 1y + 3z = 7 ⇒ 0x + 0y + 4z = 12 z = 3
1x + 2y - 1z = -10 2x + y = -2
2x + (-4) = -2
2x - 4 = -2
+ 4 + 4
2x = 2
2 2
x = 1
(x, y, z) = (1, -4, 3)
Is the answer 25? I'd like to buy a vowel for 50 please?
Answer:
The original price is $90.
Step-by-step explanation:
100% - 40% = 60%

y × 60 = 54 × 100
60y = 5400
60y ÷ 60 = 5400 ÷ 60
y = 90