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Ierofanga [76]
3 years ago
12

Solve by graphing. x + 3y = -9 5x + 3y = 3 ​

Mathematics
1 answer:
MAVERICK [17]3 years ago
3 0

Answer:

Step-by-step explanation:

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Find an exact value cos 75°
Drupady [299]

Answer:

0.2588

Step-by-step explanation:

5 0
3 years ago
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The product of the ages of a man and his son is 160. In four years time, the man will be four times as old as his son. Find thei
kati45 [8]

Answer:

father = 32    s = 5 y/o

Step-by-step explanation:

f s = 160  ====>   s = 160/f

f+4 = 4 ( s+4)  

f + 4 = 4 (160/f +4)

f + 4 = 640/f + 16

f^2 + 4f = 640 + 16 f

f^2 -12f - 640 = 0      Use Quadratic formula to find  f =  32   then s = 5

3 0
2 years ago
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What is the slope of the line that passes through the points
Jlenok [28]

<u>We are given:</u>

The line passes through the points (9,4) and (9,-5)

<u>We know that:</u>

Slope of a line = (change in y) / (change in x)

<u>Finding the slope:</u>

Change in x = final x - initial x

Change in x = 9 - 9 = 0

Slope of line = (change in y) / 0

because division by 0 is undefined:

Slope of the line is <em>Undefined</em>

We could've solved for the change in y but there's no reason to because no matter what's in the numerator, as long as the denominator is 0, the value is undefined

6 0
2 years ago
Solve the equation:<br> [3 2<br> 5 5]<br><br> [x1<br> x2]+<br> [1<br> 2]=<br> [2<br> -3]
dsp73

9514 1404 393

Answer:

  (x1, x2) = (3, -4)

Step-by-step explanation:

As with any 2-step linear equation, subtract the constant, then multiply by the inverse of the coefficient of the variable.

  \left[\begin{array}{cc}3&2\\5&5\end{array}\right]\left[\begin{array}{c}x\\y\end{array}\right]+\left[\begin{array}{c}1\\2\end{array}\right]=\left[\begin{array}{c}2\\-3\end{array}\right]\\\\\left[\begin{array}{cc}3&2\\5&5\end{array}\right]\left[\begin{array}{c}x\\y\end{array}\right]=\left[\begin{array}{c}1\\-5\end{array}\right]\\\\\left[\begin{array}{c}x\\y\end{array}\right]=\dfrac{1}{5}\left[\begin{array}{cc}5&-2\\-5&3\end{array}\right]\left[\begin{array}{c}1\\-5\end{array}\right]

Performing the multiplication of the matrix by the vector gives the solution.

  x = ((5)(1) +(-2)(-5))/5 = 15/5 = 3

  y = ((-5)(1) +(3)(-5))/5 = -20/5 = -4

Using your variables, x1, x2, the solution is ...

  (x1, x2) = (3, -4)

7 0
3 years ago
janet completed this entier column of math homework in 10 min. How many sec per question did janet spend
xxTIMURxx [149]

Step-by-step explanation:

10 minutes = 600 seconds

Seconds per question is seconds/questions

Divide 600 by the number of questions:

600/(number of questions) = ________ seconds per question

4 0
3 years ago
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