Question

A) 4х=75-х б) 8х-25=40-5х в)6(х-12)=8х-2 г)3,1+5у=7(у-4,1)

Answer 1

Ответ:

Пошаговое объяснение:

$1)4x=75-x\\4x+x=75\\5x=75\\x=75:5\\x=15\\\\2)8x-25=40-5x\\8x+5x=40+25\\13x=65\\x=65:13\\x=5\\\\3)6(x-12)=8x-2\\6x-72=8x-2\\6x-8x=-2+72\\-2x=70\\x=70:(-2)\\x=-35\\\\4)3.1+5y=7(y-4.1)\\3.1+5y=7y-28.7\\5y-7y=-28.7-3.1\\-2y=-31.8\\y=-31.8:(-2)\\y=15.9$

Answer 2

Ответ:

A)4x+x=75

5x=75

x=25

Б)8x-25=40-5x

8x+5x=40+25

13x=65

x=5

B)6(x-12)=8x-2

6x-72=8x-2

6x-8x=-2+72

-2x=70

x=-35

Г)3,1+5y=7(y-4,1)

3,1+5y=7y-28,7

5y-7y=-28,7-3,1

-2y=-31,8

y=15,9

Answer 3

It seems like you have provided a list of equations with variables. You'd like to solve these equations for the variable "x" and "y". Let's solve each equation step by step:

A) $4x = 75 - x$ Add $x$ to both sides: $4x + x = 75$ $5x = 75$ Divide both sides by $5$: $x = 15$

B) $8x - 25 = 40 - 5x$ Add $5x$ to both sides: $8x + 5x - 25 = 40$ $13x - 25 = 40$ Add $25$ to both sides: $13x = 65$ Divide both sides by $13$: $x = 5$

C) $6(x - 12) = 8x - 2$ Distribute $6$ on the left side: $6x - 72 = 8x - 2$ Subtract $6x$ from both sides: $-72 = 2x - 2$ Add $2$ to both sides: $-70 = 2x$ Divide both sides by $2$: $x = -35$

D) $3.1 + 5y = 7(y - 4.1)$ Distribute $7$ on the right side: $3.1 + 5y = 7y - 28.7$ Subtract $5y$ from both sides: $3.1 = 2y - 28.7$ Add $28.7$ to both sides: $31.8 = 2y$ Divide both sides by $2$: $y = 15.9$

So, the solutions are: A) $x = 15$ B) $x = 5$ C) $x = -35$ D) $y = 15.9$