3 years ago

Solve system by elimination -5x-10y=-20 10x+10y=0

Mathematics

2 answers:

bekas [8.4K]3 years ago

7 0

Answer:

(-4,4)

Step-by-step explanation:

-5x-10y=-20

10x+10y=0

divide both sides by 2

-5x-10y=-20

5x+5y=0

that makes

-5y=-20

divide both sides by -5

y=4

now substitute 4 for y

10x+10 x 4=0

multiply

10x+40=0

subtract

10x=-40

divide

x=-4

IrinaK [193]3 years ago

7 0

X=2 and y= -2 , i hope this helped you...

You might be interested in

What is the meaning of the ∝ sign?

ExtremeBDS [4]

Answer:

"proportional to"

Step-by-step explanation:

The sign ∝ means 'is proportional to'. This is used to show that one variable of value is proportional to another value or variable.

Example:

x ∝ y ('x' is proportional to 'y')

Hope this helps.

8 0

3 years ago

Hello! :) !!! How are you today?))) Can you help me please? :))?

Arisa [49]

is this good?

y = 3x-6 or f(x) = 3x-6

7 0

3 years ago

Trigonometry<br> Trigonometric Functions<br> Given: Sin θ = (5/6), Find: Cot θ

nikklg [1K]

Answer:

cotθ = $\sqrt{11}$ $/ 5$

Step-by-step explanation:

sine = opposite / hypotenuse

cotangent = adjacent / opposite

So first we have to solve for the adjacent side b, using pythagorean theorem

$a^{2} +b^{2} =c^{2}$

$5^{2} +b^{2} =6^{2}$

$25 + b^{2} = 36$

$b^{2} = 11$

$b = \sqrt{11}$

cotangent = adjacent / opposite

cotθ = $\sqrt{11}$ $/ 5$

6 0

4 years ago

For 30 points here you go please answer truthfully

VARVARA [1.3K]

Answer:

855 sorry i miscalculated :c okay stay safe :D

Step-by-step explanation:

enjoy

6 0

3 years ago

Please help me ASAP<br> Its not hard im just tired

Vilka [71]

Answer:

Step-by-step explanation:

= 7.4z + 8z - 12

= (7.4 + 8)z - 12

= 15.4z - 12

7 0

3 years ago