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pochemuha
3 years ago
11

Solve systems by substitution method x + y = 12 3x - y = 20

Mathematics
1 answer:
labwork [276]3 years ago
3 0

Step-by-step explanation:

x+y=12

3×+y=20

×=12-y

3 (12-y)+y=20

36-3y+y=20

36-4y=20

-4y=20-36

-4y= -16

y =16÷4

y=4

×+y=12

×+4=12

×=12-4

×=8

therefoer;y=4,x=8

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Answer is b. I know for sure

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pickupchik [31]
\bf \qquad \textit{Simple Interest Earned Amount}\\\\
A=P(1+rt)\qquad 
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\end{cases}
\\\\\\
4443.48=2567(1+r17)\implies \cfrac{4443.48}{2567}=1+17r
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5 0
3 years ago
If you sleep 6 hours a day every day for a year you are sleeping of every year. If there are 365 days in a year, how
alex41 [277]

Answer:

Step-by-step explanation:

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5 0
3 years ago
Angles A and B are complementary angles in a right triange. The value of cos(A) is 12/13. What is the value of Tan(A)
Orlov [11]
Using the pythagorean identity, we can find the value of sin(A)

cos^2(A) + sin^2(A) = 1
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144/169 + sin^2(A) = 1
sin^2(A) = 1 - 144/169
sin^2(A) = 169/169 - 144/169
sin^2(A) = (169 - 144)/169
sin^2(A) = 25/169
sin(A) = sqrt(25/169)
sin(A) = 5/13

Which is then used to find tan(A)

tan(A) = sin(A)/cos(A)
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tan(A) = (5*13)/(13*12)
tan(A) = 5/12

The final answer is 5/12

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