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a_sh-v [17]
2 years ago
15

Solve the simultaneous equations: 5x + 3y = 9 7x - 2y = 25 x=__ y=__

Mathematics
1 answer:
kondor19780726 [428]2 years ago
5 0

Answer:

x= 3, y= -2

Step-by-step explanation:

5x+3y= 9

x= 25÷7 + 2÷7 y

5(25÷7 +2÷7 y)

5( 25÷7 +2÷7 y ) + 3y= 9

y= -2

x= 25÷7 + 2÷7 x (-2)

x= 3

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If x + 3y = 7 and x - 3y =7 , then find y<br><br> Please help me
telo118 [61]

Answer:

x + 3y = 7 , x - 3y = 7 : y = , x = 7

Step-by-step explanation:

\left[\begin{array}{ccc}x + 3y = 7\\x - 3y = 7\end{array}\right]

Isolate x for x + 3y = 7 : x = 7 - 3y:

Substitute x = 7 - 3y:

\begin{bmatrix}7-3y-3y=7\end{bmatrix}

Isolate y for 7 - 3y - 3y = 7 : y = 0:

For x =7-3y

Substitute y = 0

x=7-3 * 0

7 - 3 * 0 = 7

x = 7

The solution to the system of equations are:

y=0,\:x=7

Hope I helped. If so, may I get brainliest and a thanks?

Thank you. Have a good day! =)

3 0
3 years ago
What is the standard error of the sampling distribution of sample proportion?.
storchak [24]

Answer:

√ (p(1-p) / n)

Step-by-step explanation:

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Hope this helps you! Feel free to give feedback

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