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worty [1.4K]
3 years ago
10

X-4y=28 2x+y=2 Elimination

Mathematics
1 answer:
makvit [3.9K]3 years ago
3 0

\left\{\begin{array}{ccc}x-4y=28\\2x+y=2&\text{multiply both sides by 4}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}x-4y=28\\8x+4y=8\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad9x=36\qquad\text{divide both sides by 9}\\.\qquad\boxed{x=4}\\\\\text{Put the value of x to the second equation:}\\\\2(4)+y=2\\8+y=2\qquad\text{subtract 8 from both sides}\\\boxed{y=-6}\\\\Answer:\ \boxed{x=4\ and\ y=-6\to(4,\ -6)}

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What sum of money amounts Rs.3250 in 6 yrs at the rate of 5%?
kvasek [131]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ Find the multiplier:

5% ==> 1.05

Use the formula:

final = original x multiplier^n

n is the number of years

Substitute in the values:

final = 3250 x 1.05^6

solve:

final = 4355.310832

The answer is Rs. 4355.31

<h3><u>✽</u></h3>

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8 0
3 years ago
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2 years ago
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