if the equations are a= 4+b and 3a= 12 +2b what is the value for x?

I don’t know what ‘x’ is in reference to the equations. However, you have two equations and two unknowns, so the values for a and b can be determined. To do so, eliminate one of the variables to get the value for the other and then use the value found
in the given equations to compute the first variable.

If a = 4 + b, then

3a = 12 + 3b

Now subtract that from the second equation to eliminate a:

3a = 12 + 2b

- 3a = 12 + 3b

-------------------

0 = 0 + 5b Therefore, b=0

If a = 4 + b, then

3a = 12 + 3b

Now subtract that from the second equation to eliminate a:

3a = 12 + 2b

- 3a = 12 + 3b

-------------------

0 = 0 + 5b Therefore, b=0

Then a = 4 + b becomes a = 4 + 0 = 4

So the solution is a = 4 and b = 0

So the solution is a = 4 and b = 0

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