ANSWER:
[tex]\begin{gathered} 2x+3x-6=78 \\ x=16.8 \end{gathered}[/tex]
STEP-BY-STEP EXPLANATION:
According to the graph, the sum of these two angles is equal to 78°, therefore, the equation would be:
[tex]2x+3x-6=78[/tex]
If we solve the value of x it would be:
[tex]\begin{gathered} 5x=78+6 \\ x=\frac{84}{5} \\ x=16.8 \end{gathered}[/tex]
