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ikadub [295]
2 years ago
7

Six times a number is decreased by 20 which is equal to three times the number increased by 4. what is the number?​

Mathematics
1 answer:
loris [4]2 years ago
8 0
Let the number be a
6a - 20 = 3a + 4
Group like terms
6a - 3a = 20 + 4
3a = 24
divide through by 3
a = 8
Therefore the number is 8
You might be interested in
7x - y = - 1 + -7x + 3y = - 25
Fittoniya [83]
Hope this helps you out :D

It’s 2 equations so in order to solve the previous system, you can use different methods, as for example substitution or addition of equations. In this case, you use the second one, due to the fact you have 7x in one equation and -7x in the other equation. In this way you can easily eliminate variable x and then solve for y. With the value of y you can replace in any of the two equations and solve for x.

7x-y=-1
-7x+3y=-25

Summarizing, you proceed as follow:
- add up the given equations

7x - y = -1

-7x+3y=-25
——————
0 +2y=-26

- solve for y in the previous equation

2y=-26
y=-26/2
y=-13


- replace the obtained value of y in one of the given equations, and solve for x

7x-(-13)=-1

7x+13=-1

7x=-1-13

7x=-14

x=-14

x=-14/7

x=-2


Hence, the solution of the given systems of equation is:

X=-2

Y=-13

4 0
3 years ago
8.75 is 0.5% of what number
Otrada [13]

Answer:

1750

Step-by-step explanation:

I put it in an image

but multiplyng it would have been the opposite.

and it would be 0.5% of 8.75 is what.

3 0
3 years ago
Please help, will give brainlist
yulyashka [42]

Answer:

VERTICAL

Step-by-step explanation:

6 0
2 years ago
Find the axis of symmetry F(x)=x2-8x+15
aalyn [17]

Answer:

x = 4

Step-by-step explanation:

4 0
3 years ago
Find the slope of the line joining the points (3,4) and (6,-1)
grandymaker [24]

Answer:

Step-by-step explanation:

(3,4) ; (6,-1)

slope = y₂ - y₁ / x₂-x₁

         = -1 - 4 / 6-3

         = -5/3

8 0
3 years ago
Read 2 more answers
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