help me pls and ty !

Answer:
[tex]a=2.6-3.4b[/tex]
Step-by-step explanation:
So we have the equation:
[tex]2.2a+3.4b=1.2a+2.6[/tex]
And we want to solve for a.
So, subtract 1.2a from both sides:
[tex](2.2a+3.4b)-1.2a=(1.2a+2.6)-1.2a\\1a+3.4b=2.6[/tex]
Now, subtract 3.4b from both sides:
[tex](a+3.4b)-3.4b=2.6-3.4b\\a=2.6-3.4b[/tex]
And that's our answer :)