HELP worth 20 pts :Which are equations? Select all that apply
12 = 3/4x
3.1 + x – 9
x – 4.8 = 9
1/2x - 2x + 3
x – 3.1x = 14.7 + 12

12 = 3/4x, x - 4.8 = 9, and x - 3.1x = 14.7 + 12 are all equations because you have an equal sign that has you solve for each side and you can solve for the variable, unlike with the other ones you can't solve for the variable.

Step-by-step explanation:

the fist one is not equalvalent but i think th second one isand the third isnt definetly or the last one is i think. hope this !

step-by-step explanation:

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.