Your answer is C hope this helps
the answer is B) natural gas
His full name is:
<em><u>Barack Hussein Obama II</u></em>
<em>Hope</em><em> </em><em>this</em><em> </em><em>helped</em><em> </em><em>have</em><em> </em><em>a</em><em> </em><em>good</em><em> </em><em>day</em><em> </em><em>bro</em><em> </em><em>cya</em><em><u>)</u></em>
Solve for one of the variables first ,, then whatever answer you receive from x or y , you then begin to plug it in to get other variable.