For the function:
[tex]m(x)=4x+15[/tex]
You have to find the value of x so that m(x)=7
To find the value of x you have to do as follows, first equal the expression 4x+15 to 7
[tex]7=4x+15[/tex]
Next pass 15 to the other side of the equal sign by performing the inverse operation
[tex]\begin{gathered} 7-15=4x \\ -8=4x \end{gathered}[/tex]
Finally divide both sides of the equation by 4 to reach the value of x
[tex]\begin{gathered} -\frac{8}{4}=\frac{4x}{4} \\ -2=x \end{gathered}[/tex]
So for x=-2 m(x)=7
