a. The given equation is:
[tex]-8x+36=20[/tex]
Subtract 36 from both sides:
[tex]\begin{gathered} -8x+36-36=20-36 \\ -8x=-16 \end{gathered}[/tex]
Divide both sides by -8:
[tex]\begin{gathered} -8x/-8=-16/-8 \\ x=2 \end{gathered}[/tex]
b. The given equation is:
[tex]x+y=12[/tex]
Replace the x-value we find in the previous part, and solve:
[tex]2+y=12[/tex]
Subtract 2 from both sides:
[tex]\begin{gathered} 2+y-2=12-2 \\ y=10 \end{gathered}[/tex]
c. The answer is: (2,10)
