Mathematics, 21.09.2020 01:01 Destinationz

Solve for the system of equations x/3+2/3=y/6 x/12-y/4=3/2 I need help asap Thank you :)

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Answer from: nick4524

The ordered pair (-6, -8)

This means x = -6 and y = -8 pair up together

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Explanation:

x/3+2/3=y/6 is equivalent to 2x+4 = y after multiplying both sides by the LCD 6. Multiplying both sides by the LCD always clears out the fractions.

Do a similar operation to x/12-y/4 = 3/2 to get x-3y = 18. The LCD in that case is 12.

The original system

$\begin{cases}\frac{x}{3}+\frac{2}{3} = \frac{y}{6}\\\\\frac{x}{12}-\frac{y}{4} = \frac{3}{2}\end{cases}$

turns into

$\begin{cases}2x+4 = y\\x-3y = 18\end{cases}$

after clearing out the fractions. From here, we can use substitution to solve this equivalent system. The first equation 2x+4 = y is the same as y = 2x+4. We can replace every copy of 'y' in the second equation and solve for x like so...

x - 3y = 18

x - 3( y ) = 18

x - 3( 2x+4 ) = 18 ... y replaced with 2x+4

x - 3(2x) - 3(4) = 18

x - 6x - 12 = 18

-5x - 12 = 18

-5x = 18+12

-5x = 30

x = 30/(-5)

x = -6

Which is then used to find y

y = 2x+4

y = 2(-6)+4

y = -12+4

y = -8

Put together, the solution is the ordered pair (x,y) = (-6, -8)

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We can check this through graphing and noting the two lines cross at (-6,-8)

Or we can plug (x,y) = (-6,-8) back into each original equation

Let's do the first equation

x/3 + 2/3 = y/6

-6/3 + 2/3 = -8/6

-6/3 + 2/3 = -4/3

(-6+2)/3 = -4/3

-4/3 = -4/3 ... first equation is confirmed

Now onto the second equation

x/12 - y/4 = 3/2

-6/12 - (-8)/4 = 3/2

-1/2 + 4/2 = 3/2

(-1+4)/2 = 3/2

3/2 = 3/2 .... second equation is confirmed as well

Both equations are true when we plug in (x,y) = (-6, -8) so the answer is confirmed overall.

Answer from: bryanna0105

x = - 6 ; y = - 8

Step-by-step explanation:

In the first linear eqn. in 2 variable ,

$\frac{x}{3} + \frac{2}{3} = \frac{y}{6}$

Simplifying the above eqn. gives =

$\frac{x + 2}{3} = \frac{y}{6}$

$= x + 2 = \frac{y}{2} ..............(1)$

From eqn.1 value of x in terms of y =

$x = \frac{y}{2} - 2 = \frac{y - 4}{2}$

Now in the second linear eqn. in 2 variable ,

$\frac{x}{12} - \frac{y}{4} = \frac{3}{2}$

Simplifying the above eqn. gives =

$\frac{x - 3y}{12} = \frac{3}{2}$

$= x - 3y = \frac{3}{2} \times 12 = 18......(2)$

Substituting the value of x in eqn.2 gives

$\frac{y - 4}{2} - 3y = 18$

$= \frac{y - 4 - 6y}{2} = 18$

$= \frac{ - 5y - 4}{2} = 18$

$= - 5y - 4 = 18 \times 2 = 36$

= - 5y = 36 + 4 = 40

$= y = \frac{40}{ - 5} = - 8$

Putting the value of y in eqn.1 gives =

$x + 2 = \frac{ - 8}{2} = - 4$

= x = - 4 - 2 = - 6

Answer from: Quest

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Answer from: Quest

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