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2 years ago

Substitution !! Check your solutiony - x = 3x + 22x + 2y = 14 - y (by Substitution)

Mathematics

2 answers:

GaryK [48]2 years ago

8 0

Answer:

6x+7y=14

Step-by-step explanation:

this may be wrong

but i tried

PolarNik [594]2 years ago

8 0

Step-by-step explanation:

y - x = 3x +2

y=3x+x+2

y=4x+2.......(1)

2x + 2y = 14 - y

2x+2y+y=14

2x+3y=14.........(1)

substituting value of y in equation 1

2x+3(4x+2)=14

2x+12x+6=14.

14x=14-6

14x=8

x=8/14=4/7

substituting value of x in equation 1

y=4×4/7+2=30/7

x=4/7

y=30/7

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I'm sure there's an easier way of solving it than the way I did, but I'm not sure what it could be. Never dealt with a problem like this before.

Anyway, I just plugged in and tested. Chose random values for a, b, c, and d, which follow the rule 0 < a < b < c < d:

a = 1
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$\sf ax^2+(1-a(b+c))x+abc-d)$

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Simplify into standard form:

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Use the quadratic formula to solve:

$\sf x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$

For functions in the form of $\sf ax^2+bx+c$ . So in this case:

a = 1
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c = 2

Plug them in:

$\sf x=\dfrac{4\pm\sqrt{(-4)^2-4(1)(2)}}{2(1)}$

Solve for 'x':

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rewona [7]

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Step by step explanation:

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2 years ago

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cestrela7 [59]

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Step-by-step explanation:

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2 years ago

If Richard can paint their living room in 4 hours, and Vanessa can paint the same living room in 5 hours, then how long will it

Tju [1.3M]

Answer:

2 hrs 13 mins

Step-by-step explanation:

If Richard can paint the living room in 4 hrs, then in 1 hour he can paint 1/4 of the living .

If Vanessa can paint the living room in 5 hours, then in one hour, she can paint 1/5 of the living room.

In one hour Richard and Vanessa can paint 1/4 + 1/5 = 1/y

y is the number of hours it will take both Richard and Vanessa to paint the living room. 1/y is how much of the house they can paint in one hour.

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3 years ago

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Paul [167]

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2 years ago

Substitution !! Check your solutiony - x = 3x + 22x + 2y = 14 - y (by Substitution)​

Substitution !! Check your solutiony - x = 3x + 22x + 2y = 14 - y (by Substitution)