3 years ago

What's the answer to this

Mathematics

1 answer:

aalyn [17]3 years ago

5 0

Answer:

I can't see the picture???

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A direct variation passes through the point (-3,9) given y varies directly as x find the value of y when x is 2

frutty [35]

Answer:

Step-by-step explanation:

<u>Proportions</u>

A direct proportion is a relation between variables where their ratio is a constant value. This means that if y and x are proportional, then:

y = kx

Where k is the constant of proportionality.

Substituting x=-3 y=9:

9 = k(-3)

$k=\frac{9}{-3}=-3$

Now the relationship is:

y = -3x

For x=2

y = -3(2) = -6

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3 years ago

How do I finish this problem? I keep getting stumped here

prisoha [69]

I believe you would Add like terms so 4x^2-4x-3

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3 years ago

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Please help me smile this problem ASAP

kogti [31]

Answer:

3y^7/ x 3y^5

Photomath

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3 years ago

What is 5x 5 equal to

gregori [183]

5 × 5 = 25

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5+5+5+5+5= 25

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3 years ago

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the sum of the perimeter of two squares is 40cm while the sum of the area is 58cm². Find length the side of the square.

tia_tia [17]

$a,\ b-the\ length\ of\ sides\\\\(1)\qquad4a+4b=40\qquad\text{divide both sides by 4}\\\\a+b=10\to a=10-b\\\\(2)\qquad a^2+b^2=58\\\\\text{Substitute}\ (1)\ \text{to}\ (2):\\\\(10-b)^2+b^2=58\qquad\text{Use}\ (x-y)^2=x^2-2xy+y^2\\\\10^2-2(10)(b)+b^2+b^2=58\\\\100-20b+2b^2=58\qquad\text{subtract 58 from both sides}\\\\42-20b+2b^2=0\\\\2b^2-20b+42=0\qquad\text{divide both sides by 2}\\\\b^2-10b+21=0\\\\b^2-7b-3b+21=0\\\\b(b-7)-3(b-7)=0\\\\(b-7)(b-3)=0\iff b-7=0\ \vee\ b-3=0\\\\\boxed{b=7\ \vee\ b=3}$

$\text{Put the values of b to }\ (1):\\\\for\ b=7\to a=10-7=3\\\\for\ b=3\to a=10-3=7\\\\Answer:\ \boxed{7cm\ and\ 3cm.}$

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3 years ago