When fractions are divided by each other, you're really multiplying by the "multiplicative inverse". This is the fraction, but flipped.
Answer:
As shown in picture, AC is tangent to circle O
=> angle BAC = 90 deg
As the property of angle on circle:
=> BAY = (1/2) arc BY = (1/2) x 52 = 26 deg
=> angle YAC = angle BAC - angle BAY = 90 - 26 = 64 deg
Hope this helps!
:)
3L + 5S = 90.....multiply by -3
9L + 7S = 215
-------------------
-9L - 15S = -270 (result of multiplying by -3)
9L + 7S = 216
-------------------add
- 8S = - 54
S = 54/8 = 6 3/4 or 6.75 kg (for the small boxes) <===
3L + 5S = 90
3L + 5(6.75) = 90
3L + 33.75 = 90
3L = 90 - 33.75
3L = 56.25
L = 56.25/3
L = 18 3/4 or 18.75 kg (for the large boxes) <===
