Answer:
x=10
y=5
Step-by-step explanation:
Plugin 2y for x in the first equation.
you will get -4(2y)+11y=15
then you have -8y+11y=15
3y=15
y=5
x=2y, so x=10
Answer:
(n-2) × 180°
Step-by-step explanation:
Sum of interior angles for a polygon = (n-2) × 180°
---------
you have found is yourself!
If;
A = Adjacent
O = Opposite
H = Hypotenuse
Then,
Sin Ф = O/H
Cos Ф = A/H
Therefore,
(Sin Ф)/Cos Ф) = (O/H)/(A/H) = (O/H)*(H/A) = O/A
Now,
tan Ф = O/A ----
Therefore, it is true that
tan Ф = SinФ/CosФ
Answer: -1.7 or 1 7/10
Step-by-step explanation:
Conversion a mixed number to a improper fraction: 2 1/8 = 2 · 8 + 1
8
= 17
8
Unary minus: -17
8
Conversion a mixed number to a improper fraction: 1 1/4 = 1 · 4 + 1
4
= 5
4
Divide: -17
8
: 5
4
= -17
8
· 4
5
= -17 · 4
8 · 5
= -68
40
= -17
10
To divide one fraction by another, invert the second fraction, then multiply.
Hope I helped!
Good Luck!