1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lesya [120]
3 years ago
7

3x - y = 7

Mathematics
1 answer:
mixas84 [53]3 years ago
5 0
-3x = -3 because you would multiply one of the equations by -1 to eliminate y.
You might be interested in
A cookie recipe states for every three cups of flour,1 teaspoon of vanilla are needed. how many teaspoons are needed for five cu
Brrunno [24]
For 3 cups... vanilla needed - 1 teaspoon
for 1 cup...vanilla needed- 1/3 teaspoon
for 5 cups, vanilla needed- 5/3 teaspoon

In short , 1.67 or 5/3 teaspoon of vanilla is needed for 5 cups of floor
3 0
3 years ago
The equation a = (b1 + b2)h can be used to determine the area, a, of a trapezoid with height, h, and base lengths, b1 and b2. Wh
Arlecino [84]
Hb1+hb2=a
a/h=b1+b2
a/(b1+b2)=h

8 0
3 years ago
Read 2 more answers
What type of data distribution is shown on the graph?
nadezda [96]

Answer:

Bell Curve

Step-by-step explanation:

4 0
3 years ago
Find the size of the angle using Sohcahtoa or Pythagoras.
lisov135 [29]

Answer:

x ≈ 38.7°

Step-by-step explanation:

Using the sine ratio in the right triangle

sinx = \frac{opposite}{hypotenuse} = \frac{5}{8} , then

x = sin^{-1} (\frac{5}{8} ) ≈ 38.7° ( to 1 dec. place )

6 0
2 years ago
Use a half-angle identity to find the exact value of sinPi/8
stellarik [79]

Answer:

  sin(π/8) = (1/2)√(2-√2)

Step-by-step explanation:

Using the half-angle formula ...

  \sin{\dfrac{\theta}{2}}=\sqrt{\dfrac{1-\cos{\theta}}{2}}

We can let θ = π/4 and simplify the result as follows:

  \sin{\dfrac{\pi}{8}}=\sqrt{\dfrac{1-\cos{(\pi/4)}}{2}}=\sqrt{\dfrac{1-\dfrac{\sqrt{2}}{2}}{2}}=\sqrt{\dfrac{2-\sqrt{2}}{4}}\\\\=\boxed{\dfrac{1}{2}\sqrt{2-\sqrt{2}}}}

5 0
3 years ago
Read 2 more answers
Other questions:
  • julia has 3 1/2 pounds of dog food. she plans to split it equally among her 7 dogs. how much dog food will each dog receive
    5·2 answers
  • SOMEONE PLS HELP ME !!!MATH!!<br> ATTACHED FILE BELOW<br> WILL GIVE BRAINLIEST
    5·1 answer
  • A basketball player makes 12 baskets in 20 shots. What is the ratio of baskets to shots in simplest form?
    9·2 answers
  • Roger goes to a restaurant with Cathy. They order an appetizer of calamari for $8. Roger has a glass of red wine for $4 and Cath
    10·1 answer
  • Complete the Square:<br> x^2-3x=-1<br>2x^2+7x=-6<br>x^2+10x=-8
    8·1 answer
  • A faucet is used to add water to a large bottle that already contained some water. After it has been filling for 55 ​seconds, th
    9·1 answer
  • Write an expression for the vector difference a⃗ −b⃗ using unit vectors.
    6·1 answer
  • you receive an allowance of a penny the first day of the month and the amount you receive doubles every day for the rest of the
    13·1 answer
  • The coefficients in the expansion of (x + y)6 are
    5·1 answer
  • A population of bacteria doubles every 15 hours. Initially, the population of bacteria is 40. What is this population of the bac
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!