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3 years ago

PLZZ HELPP ILL GIVE BRAINLIST

Mathematics

2 answers:

Sonja [21]3 years ago

7 0

Answer:

Step-by-step explanation:

dedylja [7]3 years ago

4 0

Answer:

Step-by-step explanation:

1) >

2) <

3) <

4) =

5) <

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Which of the following is the missing justification?

Vikki [24]

Answer:

Addition Property of Equality

Step-by-step explanation:

Given expression:

$-16+x=8\\x=24$

To find the missing justification.

We will evaluate the given expression and justify the step.

$-16+x=8$

Using Addition Property of Equality( by this property of equality we can add a number to both sides of the equation without effecting the equality of the equation)

Adding $16$ to both sides of the equation.

$-16+x+16=8+16$

$\therefore x=24$

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What two number multiply to negative 20 and add to 19

OLEGan [10]

$x;\ y-the\ numbers\\\\ \left\{\begin{array}{ccc}xy=-20\\x+y=19&\Rightarrow&x=19-y\end{array}\right\\\\subtitute\ to\ first\ equation:\\\\(19-y)y=-20\\19y-y^2+20=0\\-y^2+19y+20=0\ \ \ |change\ signs\\y^2-19y-20=0\\y^2-20y+y-20=0\\y(y-20)+1(y-20)+0\\(y-20)(y+1)=0\iff y-20=0\ or\ y+1=0\\\\y=20\ or\ y=-1$

$x=19-y\\\\for\ y=20\Rightarrow x=19-20=-1\\\\for\ y=-1\Rightarrow x=19-(-1)=20\\\\Answer:\boxed{\boxed{20\ and\ -1}}$

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3 years ago

Solve using substitution 7x-6y=-20<br> Y=1

maksim [4K]

Answer:

x = -2

Step-by-step explanation:

7x -6y = -20

y=1

7x - 6 = -20

7x = -14

x = -2

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