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
State the various transformations applied to the base function to obtain a graph of the functiong(x) = |x + 1| − 2.
Arlecino [84]
345 i love your mom and I love your hair
7 0
3 years ago
Write five names for 64 .
Natali [406]
In word form: Sixty four
in expanded form: 6x10 + 4x1
in place value form: 6 tens + 4 ones
in Roman numeral form: LXIV
in Arabic numeral form: ٦٤
4 0
3 years ago
Read 2 more answers
Choose the answer. 3. (1 pt) Which is an example of the distributive property? A. 9 • (t + 5) = 9t + 45 B. 9 • (t + 5) = (t + 5)
saw5 [17]
The answer is A. this is because your are multiplying by 9 throughout
5 0
3 years ago
Read 2 more answers
The ladder in a fire station is 29 feet (ft) tall. The ladder is anchored to the basement floor and the second floor ceiling. Th
Eduardwww [97]

Answer:

top = 17ft

bottom = -12ft

Step-by-step explanation:

As seen in the badly drawn picture attached in this question we are trying to find the point at the top of the ladder and the point at the bottom of the ladder. As seen in the picture ground level has an altitude of 0 ft meaning that lower than this would be in the negatives. Since the basement floor is 12 feet below ground level then this point would be -12 ft. Now since we know that the ladder is 29ft tall we simply add this height to the basement floor value to get the value of the 2nd floor ceiling (top of the ladder).

29ft + ( -12ft) = 17ft

Therefore we can see that the point at the top of the ladder is 17ft.

8 0
3 years ago
Can someone help me solve these two questions please
Vaselesa [24]

Answer:

hope this help

Step-by-step explanation:

sorry..I send pic instead..hope this help

4 0
3 years ago
Other questions:
  • A(-5, -1) and B(4, 3.5)
    8·1 answer
  • BRAINLIST OPPORTUNITY! <br> HELP QUICKKKK!!!!
    8·1 answer
  • PLEASE HELP 15 POINTS + BRAINLIEST Find the coordinates of the other endpoint of the​ segment, given its midpoint and one endpoi
    14·2 answers
  • What is the solution to the inequality? 17 &lt; 9 + x
    9·2 answers
  • All integer are rational number. true or false? please explain
    12·2 answers
  • A geneticist grows 15 pea plants for each experiment. Assume that he has carried out an infinite number of experiments and measu
    7·2 answers
  • The Temple at the top of the pyramid is approximately 24 m above the ground and they are 91 steps leading up to the temple. How
    14·1 answer
  • Please help me <br>thank ​
    10·1 answer
  • Several students measured a 25mm long nail and wrote the measurements shown in the table below. Whose measurement had the greate
    11·1 answer
  • 3. Martin has a very limited wardrobe. He has four pairs of pants: one blue, one green, one tan, and one white. He also has five
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!