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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
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Please help answer <br> Will give Brainlst
Artyom0805 [142]

Answer:

x= -3

y= -5

Step-by-step explanation:

10y - 3x = -41

+

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10y + (-5y) = 5y

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y = -25/5

y= -5

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4 0
2 years ago
Using Ratios to Solve Problems - Item 1457 Question 4 of 7 Evan's family drove to a theme park for vacation. They drove the same
azamat

Answer:

150 miles

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Step-by-step explanation:

Note: it was given that they drove the same speed throughout the trip. That means their speed is constant for all days;

For the first day

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time = 6 hours

Speed = distance/time

Speed = 300/6 = 50 mph

on the third day;

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5 0
3 years ago
Jim Abbott purchased a $58,000 recreational vehicle (RV) with a 45 percent markup on selling price. a. What was the amount of th
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Sonbull [250]

Answer:

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Step-by-step explanation:

Factor the following:

-4 x^2 + 4 x - 10

Factor -2 out of -4 x^2 + 4 x - 10:

Answer:  -2 (2 x^2 - 2 x + 5)

3 0
2 years ago
Read 2 more answers
Solve the equation?<br><br> 13 +w/7 = –18 ...?
Degger [83]
The equation given in the question is

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w = - 126 - 91
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I hope that the procedure is clear enough for you to understand. I also hope that this is the answer that you were looking for and the answer has actually come to your desired help.
3 0
2 years ago
Read 2 more answers
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