Answer:
-78.4
Explanation:
Given the expression
[tex]9.1+\frac{y}{7}=-2.1[/tex]Multiply through by 7:
[tex]\begin{gathered} 7(9.1)+y\text{ = 7(-2.1)} \\ 63.7+y=-14.7 \end{gathered}[/tex]Subtract 63.7 from both sides
[tex]\begin{gathered} 63.7+y-63.7=-14.7-63.7 \\ y=-78.4 \end{gathered}[/tex]Hence the value of y is -78.4
