12=3y-y+4y
i know that y=2 but i need to know the step by steps

This is my best explanation

Step-by-step explanation:

3y-y=2y

2y+4y=6y

Now you need to divide 12 by 6 to get the value of y

That will be 12/6=2

So, y=2

Have a nice day.

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions

i hope this is what you were looking for.

see attached graph