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3 years ago

What is 3x+5=-7 solve for x

2 answers:

4 0

Move the five to the other side to make Make it a -5

then combine -7 to -5 to make it -12 anytime you subtract a negative number to a negative number you do the same thing as adding to it when you use a positive number to a negative number you flip it the other way

3x=-12 is how it should be set up if done correctly divide 3X to -12 which should solve X equals -4

Gnesinka [82]3 years ago

3 0

Answer:

x = 2/3

Step-by-step explanation:

3x + 5 = 7

subtract 5 from both sides

3x = 2

divide both sides by 3

x = 2/3

hope that helps!

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5x=-4y+4;x= 1,2,3 solve equation then find value of y

nadezda [96]

x = 1 5(1)= -4y + 4 5= -4y + 4 -4. -4 1 = -4y y = -¼ x = 2... 10 = -4y + 4 6 = -4y y = -3/2 x = 3.. 15 = -4y + 4 11 = -4y y = -11/4

7 0

3 years ago

Read 2 more answers

The United States is about the only country that still uses the units feet, miles, and gallons. However, you might see some car

Black_prince [1.1K]

Answer: $4.5 \text{ miles per gallon}$

Step-by-step explanation:

Given : The fuel efficiency of car = 7.6 km per kilogram

We also given that

1 mile = 1.609 km

Then, $\text{1 km}=\dfrac{1}{0.609}\text{ mile}$

1 gallon = 3.785 liters

$\text{1 liter}=\dfrac{1}{3.785}\text{ gallon}$

1 liter of gasoline = 0.729 kg

Then, $\text{1 kg}=\dfrac{1}{0.729}\text{ liter}$

$\Rightarrow\ \text{1 kg}=\dfrac{1}{0.729}\times\dfrac{1}{3.785}\text{gallon}$

Now, the fuel efficiency of car will be :

$7.6\times\dfrac{1}{0.729}\times\dfrac{1}{3.785}\times\dfrac{1}{0.609}\\\\=4.52275317827\approx4.5 \text{ miles per gallon}$

Hence, the car’s fuel efficiency in miles per gallon= 4.5

3 0

3 years ago

4x + 3y = 6 3x + 5y = -1 Solve the simultaneous equations. y= z=

Kisachek [45]

Answer:

x=3, y= -2

Step-by-step explanation:

Multiplying :

(4x+3y =6)*-3

(3x+5y =-1)*4

-12x -9y= -18

12x+20y= -4

Add the equations

20y-9y = -4-18

11y = -22

y= -22/11 = -2

3x +5* -2= -1

3x -10 = -1

3x = 10-1

x= 9/3 =3

4 0

3 years ago

What is the surface area of a right come with a radius of 20 and a height of 15?

Allisa [31]

The first step in finding the surface area of a cone is to measure the radius of the circle part of the cone. The next step is to find the area of the circle, or base. The area of a circle is 3.14 times the radius squared (πr2). Now, you will need to find the area of the cone itself. In order to do this, you must measure the side (slant height) of the cone. Make sure you use the same form of measurement as the radius.

You can now use the measurement of the side to find the area of the cone. The formula for the area of a cone is 3.14 times the radius times the side (πrl).

So the surface area of the cone equals the area of the circle plus the area of the cone and the final formula is given by:

SA = πr2 + πrl

5 0

3 years ago

kayla took $36.75 to the state fair. each ticket in the fair cost x dollars. kayla bought 3 tickets. write an expression that re

Gennadij [26K]

F(x)=y=the amount of money, in dollars , that Kad had after she bought the tickets.
x=price of one ticket

f(x)=-3x+36.75 or y=-3x+36.75

7 0

3 years ago