3 years ago

What is 10x-10y=0 -20x-5y=-25

Mathematics

2 answers:

laiz [17]3 years ago

7 0

Solve for the first variable in one of the equation, then substitute the results into the other equation (1,1)

Arada [10]3 years ago

6 0

-10x-15-(-25)

-5(2x+3-5)

-5(2x-2)

-5*2 (x-1)

= -10(x-1)

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mina [271]

Hello from MrBillDoesMath!

Answer:

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Y * x = 20<br><br> y + x = 9 <br><br> what numbers are y and x equal to?

Ksivusya [100]

$y = 9 - x$
Substitute into
$y \times x = 20 \\ (9 - x) \times x = 20 \\ { - x}^{2} + 9x = 20 \\ {x}^{2} - 9x + 20 = 0 \\ (x - 5)(x -4) = 0 \\ x = 5 \: or \: x = 4$
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Hope this helps. - M

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