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Hatshy [7]
3 years ago
5

Solve the system of equations using matrices. x+7y=02x−8y=22 Question 7 (Mandatory) (1 point) Step 1. Find the coefficient matri

x. A=[blank 1blank 3blank 2blank 4]
Mathematics
1 answer:
Alex Ar [27]3 years ago
4 0

Answer:

x=7

y =-1

Step-by-step explanation:

Given is a system of equations in x and y as

x+7y=0\\2x-8y =22

This can be written in matrix form as

Ax = B

\left[\begin{array}{ccc}1&7\\2&-8\end{array}\right]\left[\begin{array}{ccc}x\\y\end{array}\right]  =\left[\begin{array}{ccc}0\\22\end{array}\right]

Let us find inverse of A

|A| = -8-14 =-22

A^{-1} =\frac{-1}{22} *\left[\begin{array}{ccc}-8&-7\\-2&1\end{array}\right]

X= A ^(-1) B

x=7, y =-1

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Anarel [89]

Answer:

9/7

Step-by-step explanation:

13/14 - 1/7 + 1/2

taking LCM

=(13-2+7)/14

=18/14

to its lowest term

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6 0
2 years ago
Read 2 more answers
3. Given ABCD ≅ FGHJ and mC = 9x - 7, mH = 5x + 13, find the value of x and the measures of angle C and angle H. Show all work
Bas_tet [7]
Since congruence and similarity for polygons is posted in a specific order, we know that angle A=angle F, side A=side F, die B=side G, and so on. Therefore, we have that angle C=angle H = 9x-7=5x+13. Subtracting 5x from both sides to separate the x using the subtraction property of equality, we get 4x-7=13. Next, we can add 7 to both sides to get 4x=20, and divide both sides by 4 to isolate the x and get x=5. Plugging that into angle C or angle H, we get that 9x-7=9*5-7=45-7=38=5*5+13.

Feel free to ask further questions!
5 0
3 years ago
Segment AB has point A located at (8,9). If the distance from A to B is 10 units, which of the following could be used to calcul
Ulleksa [173]

Answer:

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7 0
2 years ago
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Answer:

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Step-by-step explanation:

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3 0
2 years ago
twelve students have an equally likely chance of being selected in a drawing at school. eight are girls and four are boys. what
andriy [413]

Answer:

33% chance

Step-by-step explanation:

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8 0
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