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3 years ago

How do you solve the equation 2x - 125 = 400

2 answers:

6 0

You add -125 by its opposite which is 125 so 2x(-125+125)=400+125
2x=525
You then divide both sides by 2 and you get
X=262.5

djyliett [7]3 years ago

3 0

2x-125=400

Add 125 to both sides

2x-125+125=400+125

2x=525

Divide both sides by 2

2x/2=525/2

x= 262.5

Let me check if my work is good

2(262.5)-125=400

525-125=400

400=400

So yes , my answer is good and I hope its help !

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4 years ago

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andreyandreev [35.5K]

$\huge\text{$m\angle O=\boxed{11^{\circ}}$}$

Since we know that all angles in a triangle add up to $180^{\circ}$ , we can solve for $x$ and substitute it back into $(x-5)^{\circ}$ to find $m\angle O$ .

$\begin{aligned}m\angle N+m\angle O+m\angle P&=180\\(5x-8)+(x-5)+(6x+1)&=180\end{aligned}$

Remove the parentheses and combine like terms.

$\begin{aligned}5x-8+x-5+6x+1&=180\\(5x+x+6x)+(-8-5+1)&=180\\12x-12&=180\end{aligned}$

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$\begin{aligned}12x-12&=180\\12x&=192\end{aligned}$

Divide both sides of the equation by $12$ .

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