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Leviafan [203]
2 years ago
9

-2x+10y=25 X-25y=3 Elimination method

Mathematics
2 answers:
Mrac [35]2 years ago
8 0

Answer:

equation form: x=-131/8y -31/40

Step-by-step explanation:

this is addition/elimination

shusha [124]2 years ago
8 0

Step-by-step explanation:

(-2x+10y=25) × 2.5

-5x+25y=62.5

x-25y=3

-5x+x+25y-25y=62.5+3

-4x=65.5

x =65.5÷4

=16.375

16.375-25y=3

-25y=3-16.375

-25y=-13.375

y=- 13.375÷-25

=0.535

i tried.

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The sides of a rectangle are in the ratio 5 : 4. If the perimeter of the rectangle is 360 cm , find its area
djverab [1.8K]

Answer:

Step-by-step explanation:

let, the length is z

thus the ratio will be 5z : 4z

perimeter = 2 (a + b)

360 = 2 ( 5z + 4z )

180 = 9z

z = 20 cm

length = 100 cm and width = 80cm

area = length * width

area = 100*80

area = 8000cm²

4 0
2 years ago
Work out the size of angel x. <br><br>​
aniked [119]

Answer:

<h2>x=52</h2>

Basic fact:

<em>angles in a point add up to 360</em>

Step-by-step explanation:

20+165+33+90(that is the right angle)+x=360

20+165+33+90=308

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4 0
2 years ago
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For the following system, if you isolated x in the first equation to use the substitution method, what expression would you subs
alekssr [168]

Answer:

x=2y+6

Step-by-step explanation:

So we have the system:

-x+2y=-6\\3x+y=8

If we isolate the x-variable in the first equation:

-x+2y=-6

Subtract 2y from both sides:

-x=-6-2y

Divide both sides by -1:

x=2y+6

Therefore, we would substitute the above into the second equation:

3x+y=8\\3(2y+6)+y=8

The answer is 2y+6

Further notes:

To solve for the system, distribute:

6y+18+y=8

Simplify:

7y+18=8

Subtract:

7y=-10

Divide:

y=-10/7\approx-1.4286

Now, substitute this value back into the isolated equation:

x=2(-10/7)+6\\x=-20/7+42/7\\x=22/7\approx3.1429

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2 years ago
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I will give brainiest to whoever answers correctly !!
schepotkina [342]

Answer:

12,000

Step-by-step explanation:

i believe this would be what she withdrew but if not i'm sorry for giving the wrong answer

7 0
2 years ago
Write an equation that is perpendicular to x-3y=2 and contains the point (2,4)
Kisachek [45]

perp to x-3y=2 thru (2,4)

For perpendicular we swap the coefficients on x and y, negating one

3x + y = some constant

We get the constant in the obvious way from the point

3x + y = 3(2) + 4 = 6 + 4 = 10

Answer: 3x + y = 10

6 0
3 years ago
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