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
ale4655 [162]
3 years ago
11

Use cramers rule to solve 4x+3y=4 -3x-y=7 show your work

Mathematics
1 answer:
Nataly_w [17]3 years ago
8 0
\left\{\begin{array}{ccc}4x+3y=4\\-3x-y=7\end{array}\right\\\\D=  \left|\begin{array}{ccc}4&3\\-3&-1\end{array}\right|=(4)(-1)-(-3)(3)=-4+9=5\\\\D_x=\left|\begin{array}{ccc}4&3\\7&-1\end{array}\right|=(4)(-1)-(7)(3)=-4-21=-25\\\\D_y=\left|\begin{array}{ccc}4&4\\-3&7\end{array}\right|=(4)(7)-(-3)(4)=28+12=40\\\\x=\dfrac{D_x}{D}\Rightarrow x=\dfrac{-25}{5}=-5\\\\y=\dfrac{D_y}{D}\Rightarrow y=\dfrac{40}{5}=8
You might be interested in
Find the perimeter of each figure by writing and solving an ewuation for the varible, x​
grandymaker [24]
6(x-1)
4x

X = 6*x-1*6/6x-6=4x
X= -6=4x-6x
X=-6=-2x
Value of x Is 3
8 0
3 years ago
How do you add 1/15 + 1/6?
Brut [27]
you are going to need to find the common name of common denominator 4/1 over 4 plus 1 over 6 equal to look for the commentator of 15 and 6 what goes into 15 and 6 is going to 15 and 6 the common denominator will be actually 12 to 6 only go into 15 2 times cuz I can't get close to 15 than q2 so you have to common denominator now this is going to be both 1/12 + 1/12 is going to be either 2/24 or 2/12
6 0
3 years ago
Read 2 more answers
If A = (10, 4) and B= (2, 19), what is the length of AB
Contact [7]

Answer:

The length of  AB = 17

Step-by-step explanation:

AB = √[(10-2)^2 + (4-19)^2]

AB = √(64 + 225)

AB = √289

AB = 17

8 0
4 years ago
What value of x is in the solution set of –5x – 15 > 10 + 20x?
Blizzard [7]
-5x - 15 > 10 + 20x / + 15
-5x > 25 + 20x / - 20x
-25x > 25 / ÷ ( -25 )
x < - 1
7 0
3 years ago
Read 2 more answers
Tommy the Terrapin crawls 3 inches every 2 seconds.Sammy the snail crawls 5 inches every 3vseconds. The two pals have a race to
olga nikolaevna [1]
Tommy will take 10 sec and Sammy will do it in 15 sec hope this help can I get brainlist?
7 0
3 years ago
Other questions:
  • Two stores carry a similar stereo for the same original price of $573. One store offers a 16% discount and the second store sell
    11·1 answer
  • 2. A spike train, commonly used to study neural activity, is a sequence of recorded times at which a neuron fires an action pote
    7·1 answer
  • A {1,2,3,4}<br> B {2,4,9,16}<br> C {1,2}<br> D {1,2,3,4,9,16}
    7·2 answers
  • This is a standard deviation contest. You must choose four numbers from the whole numbers 0 to 10 , with repeats allowed. (a) Ch
    5·1 answer
  • A city doubles its size every 12 years. If the population is currently 500,000, what will the population be in 24 years?
    14·2 answers
  • Explain what the differences between an arithmetic and geometric sequence are? IN FULL SENTENCES. *
    7·1 answer
  • Your friend evaluates the expression when m = 10. is your friend correct? Explain your reasoning.
    14·2 answers
  • Time 6:20 +35 mins time =
    11·1 answer
  • What is 2.73 divided by 30
    8·2 answers
  • A graphic designer wants to create a rectangular graphic that has a 2-inch margin on each side and a 4-inch margin on the top an
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!