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-Dominant- [34]

2 years ago

10

Solve the system of equations by the addition method. 1 - 3x = -5y - 8 6x 3y = -5

1 answer:

Advocard [28]2 years ago

3 0

$-3x = -5y -8~~~....(i) \\\\6x -3y = -5 ~~......(ii)\\\\\text{Multiply equation (i) by 2 and do (i) + (ii):}\\\\2 \cdot (-3x) + 6x -3y = 2(-5y-8) + (-5)\\\\\implies -6x +6x -3y = -10y -16 -5 \\\\\implies -3y = -10y -21\\\\\implies -3y +10y =-21\\\\\implies 7y = -21 \\\\\implies y = -\dfrac{21} 7 = -3\\\\\text{Substitute}~y =-3~ \text{in equation (ii):} \\\\6x - 3(-3) = -5\\\\\implies 6x +9 = -5\\\\\implies 6x = -5 -9 = -14\\\\\implies x = -\dfrac{14}6 = - \dfrac{7}3\\$

$\text{Hence}~ (x,y) = \left(-\dfrac 73, -3 \right)$

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ehidna [41]

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d1i1m1o1n [39]

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mote1985 [20]

Solution

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3 $\frac{1}{10}$ % = 3 + 1/10 = 3 + 0.10 = 3.10%

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3 $\frac{1}{3}$ % = 3 + 0.33 = 3.33%

Now we can easily, compare the numbers and write from greatest to least.

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Thank you :)

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