Question

1. −18−9y=174+7y 2. 7⋅(6x−9)−6⋅(7x+9)=−117. 3. 1/28x+6=24+1/7x

Answer 1

Объяснение:

1) - 16у = 192

У = - 12

2) 42х - 63 - 42х - 54 = 117

117= 117

3) 1/28х + 6 = 24 + 1/7х

1/28 - 1/7 = - 6 +24

(1-4)/28 = 18

2/28x =18

1/14 x = 18

Или даже 3 не правильно, но 1 и второе правильные

Answer 2

1
-9у-7у=174+18
-16у=192
у=-12
2
42х-63-42х-54=-117
-63-54=-117
-117=-117
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3
1/28х+6=24+1/7х
33х=56
Або х=1,69

Answer 3

To solve these equations, we'll need to isolate the variable (usually "x" or "y") on one side of the equation. Let's solve each of them step by step:

1. -18 - 9y = 174 + 7y

   First, let's get all the terms involving "y" on one side and constants on the other side:

   -18 - 174 = 7y + 9y

   -192 = 16y

   Now, divide both sides by 16 to solve for "y":

   -192 / 16 = 16y / 16

   -12 = y

   So, the solution is y = -12.

2. 7*(6x - 9) - 6*(7x + 9) = -117

   First, distribute the constants on the left side of the equation:

   42x - 63 - 42x - 54 = -117

   Now, combine like terms:

   -63 - 54 = -117

   -117 = -117

   This equation is always true, which means it is an identity. In this case, there is no specific solution for "x," as any value of "x" will satisfy the equation.

3. (1/28)x + 6 = 24 + (1/7)x

   To solve this equation, first, get all the terms involving "x" on one side and constants on the other side:

   (1/28)x - (1/7)x = 24 - 6

   Now, find a common denominator for the fractions:

   (1/28 - 4/28)x = 18

   Combine the fractions:

   (-3/28)x = 18

   Now, isolate "x" by multiplying both sides by the reciprocal of (-3/28), which is (-28/3):

   x = 18 * (-28/3)

   x = -6 * 28

   x = -168

   So, the solution is x = -168.