I think it might be pairs 2 & 3
This is an example of The Distributive Property.
We can tell this because the number on the outside of the parenthesis on the left side has been distributed to each number inside on the right. You do this by multiplying each number by the number on the outside.
Salutations!
Let the number be

Your equation would be

Now that we have our equation, lets solve this!
Solve this by keeping the variables aside, and the numbers aside

The sign would change because your are isolating the number


Hope I helped (:
Have a great day!
Respuesta:
a = 82; b 164
Explicación paso a paso:
a = 1 / 2b - - - (1)
a gana 66 = a + 66
b = b - 90
a = 2b
a + 66 = 2 (segundo - 90) - - - (2)
Ponga a = 1 / 2b en (2)
1 / 2b + 66 = 2 (b-90)
0.5b + 66 = 2b - 180
0.5b - 2b = - 180 - 66
-1,5b = - 246
b = 164
a = 1 / 2b
a = 1/2 * 164
a = 82
The graphs are identical and intersect at infinitely many points.
This is because 2(2x+3) is the same as 4x+6
Distribute the outer 2 to each term inside
2 times 2x = 4x
2 times 3 = 6
So 2(2x+3) simplifies to 4x+6
Or you can think of 4x+6 factoring to 2(2x+3)