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
padilas [110]
3 years ago
14

use the matrix tool to solve the system of equations enter the answer as an ordered pair. 8x+5y=9 -x+y=7

Mathematics
1 answer:
Dimas [21]3 years ago
6 0

Answer:

x = -44/13

y = -65/13

Step-by-step explanation:

Using matrix form means using the crammers rule

The matrix form of the expression is written as;

\left[\begin{array}{ccc}8&5\\-1&1\\\end{array}\right] \left[\begin{array}{ccc}x\\y\\\end{array}\right] = \left[\begin{array}{ccc}9\\7\\\end{array}\right]

AX = B

taking the determinant of A;

|A| = 8(1) - 5(-1)

|A| = 8 + 5

|A| = 13

After replacing the first row with the column matrix;

A_x =\left[\begin{array}{ccc}9&5\\7&-1\\\end{array}\right]

|Ax| = 9(-1)-5(7)

||Ax| = -9 - 35

|Ax| = -44

x = |Ax|/|A|

x = -44/13

similarly for y

A_x =\left[\begin{array}{ccc}8&9\\-1&7\\\end{array}\right]

|Ay| = 8(7)+9

|Ay| = 56+9

|Ay| = 65

y = |Ay|/|A|

y = -65/13

You might be interested in
What is the ratio as a fraction in lowest term for $300 to $450 ?
Advocard [28]
Just divide 300 by 450, to get 0.66667, which can be expressed as a fraction by 2/3
5 0
3 years ago
I ben buys a pair of GUCCI FLIP FLOPS for $24.78 and pays with a $50 how mutch change does he get back? ps real question just ch
galina1969 [7]

Answer: 25.22


Step-by-step explanation:

24.78 - 50 = 25.22

5 0
3 years ago
Read 2 more answers
A ramp is used to load suitcases on an airplane. If the cargo door is 7 feet from the ground and the angle formed by the end of
melisa1 [442]

Answer: 16.56\ ft

Step-by-step explanation:

You must draw a right triangle as the one attached, where "x" is the lenght  in feet of the ramp.

You need to use the following Trigonometric Identity:

sin\alpha=\frac{opposite}{hypotenuse}

In this case you can identify that:

\alpha =25\°\\\\opposite=7\\\\hypotenuse=x

Now you must substitute these values into sin\alpha=\frac{opposite}{hypotenuse}:

sin(25\°)=\frac{7}{x}

Finally, you must solve for "x" in order to find its value.

This is:

sin(25\°)=\frac{7}{x}\\\\xsin(25\°)=7\\\\x=\frac{7}{sin(25\°)}\\\\x=16.56

6 0
3 years ago
Marvel or DC? Which is better?
goldfiish [28.3K]

Answer: Abby- Marvel

Step-by-step explanation:

Just way better and deeper plotline in my personal opinion.

8 0
3 years ago
Read 2 more answers
WHY IS THIS GETTING DELETED?? I NEED HELP
aliina [53]

If this exact question is repeatedly deleted, it's probably because of the ambiguity of the given equation. I see two likely interpretations, for instance:

\dfrac{(5\times5)^k}{5^{-8}} = 5^3

or

\dfrac{5\times 5^k}{5^{-8}} = 5^3

If the first one is what you intended, then

\dfrac{(5\times5)^k}{5^{-8}} = \dfrac{(5^2)^k}{5^{-8}} = \dfrac{5^{2k}}{5^{-8}} = 5^{2k-(-8)} = 5^{2k+8} = 5^3

and it follows that

2<em>k</em> + 8 = 3   ==>   2<em>k</em> = -5   ==>   <em>k</em> = -5/2

If you meant the second one, then

\dfrac{5\times 5^k}{5^{-8}} = \dfrac{5^1\times5^k}{5^{-8}} = \dfrac{5^{k+1}}{5^{-8}} = 5^{k+1-(-8)} = 5^{k+9} = 5^3

which would give

<em>k</em> + 9 = 3   ==>   <em>k</em> = -6

And for all I know, you might have meant some other alternative... When you can, you should include a picture of your problem.

3 0
3 years ago
Other questions:
  • The equations 5x + 2y = 48 and 3x + 2y = 32 represent the money collected from school concert ticket sales during two class peri
    15·1 answer
  • What is the answer to<br><br> 8(42)=8(40+2)=
    10·1 answer
  • Which of the following expressions is correct?
    15·2 answers
  • Can someone help me please? What is 6 times 6 plus 9 divided by 10 in the second power?
    12·1 answer
  • Find the value of "r" in c = 2πr if c = 16.328. show your solution.
    12·1 answer
  • Melissa collected the data in the table.
    14·2 answers
  • Part a: identity a fraction equivalent to 15/60. show all work.
    7·2 answers
  • The pie chart shows information about the grades achieved by all of the candidates in Keval's school who took AS Level English i
    11·1 answer
  • Find the sum.express your answer in simplest form
    15·1 answer
  • HELP ASAP PLZ
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!