The answer is: " 41 " .
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→ " y = 41 " .
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Explanation:
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From the "image attached", note that:
"139" and "y" ; together; form a "straight line" ;
→ that is: "139" and "y" are supplementary ;
and by definition; "supplementary angles" add up to " 180 degrees" ;
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→ y + 139 = 180 ; Solve for "y" ;
Subtract " 139 " from each side of the equation;
to isolate "y" on one side of the equation; & to solve for "y" ;
→ y + 139 − 139 = 180 − 139 ;
to get:
→ y = 41 degrees:
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The answer is: " 41 " .
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→ " y = 41 " .
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