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3 years ago

5

Ok can someone please help me? 15 pts

1 answer:

Citrus2011 [14]3 years ago

7 0

Answer:

3.2

Step-by-step explanation:

12.8/4 which makes the answer 3.2

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Solve: <br>x + y = 7<br>3x - 2y = 11<br><br>By using Substituting method.

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$\large\underline{\sf{Solution-}}$

$\sf \longmapsto x + y = 7 \: \: - - - (i)$

$\sf \longmapsto 3x - 2y = 11 \: \: - - - (ii)$

<u>By first equation,</u>

$\sf \longmapsto x + y = 7$

$\sf \longmapsto x = 7 - y$

<u>Now, we can find the original value of y.</u>

$\sf \longmapsto 3x - 2y = 11$

$\sf \longmapsto 3(7 - y) - 2y = 11$

$\sf \longmapsto 21 - 3y - 2y = 11$

$\sf \longmapsto 21 - 5y = 11$

$\sf \longmapsto - 5y = 11 - 21$

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<u>Now, we can find the original value of x.</u>

$\sf \longmapsto x + y = 7$

$\sf \longmapsto x + 2 = 7$

$\sf \longmapsto x = 7 - 2$

$\sf \longmapsto x = 5$

Therefore, the values of x and y are 5 and 2 respectively.

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