All categories

3 years ago

X-y=3 Work out the value for 2x-2y

Mathematics

2 answers:

masha68 [24]3 years ago

8 0

Answer:

Step-by-step explanation:

2x-2y = 2(x-y) = 2(3) = 6

Nostrana [21]3 years ago

5 0

If x-y =3
Then 2x -2y =?
2 is common so 2(X-Y)= 2(3)
So 2x-2y=6

You might be interested in

The x value in x squared -5x + 4= 0

zheka24 [161]

Answer:

x=0.8

Step-by-step explanation:

-5x + 4= 0

-4 -4

-5x=-4

÷5

-x=-0.8

x=0.8

6 0

3 years ago

It gives me adds that i cant skip the keeps me here

ycow [4]

Re download it or sum

5 0

3 years ago

The total number of? restaurant-purchased meals that the average person will eat in a? restaurant, in a? car, or at home in a ye

zmey [24]

Answer:

The number of restaurant-purchased meals eaten in a restaurant is 75, the number eaten in a car is 33 and the number eaten at home is 55.

Step-by-step explanation:

Suppose, the number of meals eaten in a restaurant is $x$ , in a car is $y$ and at home is $z$

The total number of meals eaten in a restaurant, in a car or at home is given as 163. So, the first equation will be......

$x+y+z=163 .............................(1)$

The total number meals eaten in a car or at home exceeds the number eaten in a restaurant by 13. So, the second equation will be......

$y+z=x+13 ................................(2)$

Twenty more restaurant-purchased meals will be eaten in a restaurant than at home. So, the third equation will be......

$x= z+20..................................(3)$

First, substituting equation (2) into equation (1), we will get........

$x+(x+13)=163\\ \\ \Rightarrow 2x+13=163\\ \\ \Rightarrow 2x=163-13=150\\ \\ \Rightarrow x=\frac{150}{2}=75$

Now plugging this $x=75$ into equation (3), we will get......

$75=z+20\\ \\ \Rightarrow z=75-20= 55$

Plugging $x=75$ and $z=55$ into equation (1) .........

$75+y+55=163\\ \\ \Rightarrow y+130=163\\ \\ \Rightarrow y=163-130=33$

So, the number of restaurant-purchased meals eaten in a restaurant is 75, the number eaten in a car is 33 and the number eaten at home is 55.

8 0

3 years ago

Emily sells bracelets for $12 each. She wants to discount them so that they only cost $9. What percent will she need to discount

Sliva [168]

100/12*9=75 thus 25% less

5 0

3 years ago

Read 2 more answers

Susie and Amelia solved the same equation using two separate methods. Their work is shown in the table below:

kvv77 [185]

Stephen and Aaron solved the same equation using two separate methods. Their work is shown in the table below:

Stephen Aaron:
3x - 2 = 5x - 6 3x - 2 = 5x - 6
3x - 2 + 2 = 5x - 6 + 2 3x - 3x - 2 = 5x - 3x - 6
3x = 5x - 4 -2 = 2x - 6
3x - 5x = 5x - 5x - 4 -2 - 6 = 2x
-2x = -4 -8 = 2x
x = 2 -4 = x

Identify who made the error and what he did wrong.
Aaron made the error when he subtracted 6.

Aaron made the error when he subtracted 3x.

Stephen made the error when he added 2.

Stephen made the error when he subtracted 5x.

answer:

In the Aaron`s work:
- 2 = - 2 x - 6
and after that:
- 2 - 6 = 2 x
It should be:
- 2 + 6 = 2 x
or: - 2 + 6 = 2 x - 6 + 6
Answer:
A ) Aaron made the error when he subtracted 6.

5 0

3 years ago