Answer:
[tex]f(-5)=15[/tex]
Step-by-step explanation:
We have a linear equation:
[tex]y=ax+b[/tex]
Where:
[tex]a=Slope\\b=intercept\hspace{3}with\hspace{3}the\hspace{3}y\hspace{3}axis[/tex]
So:
f(x)=5x+40
Represents a straight line with a slope equal to 5 and intercept with the y-axis at 40.
Now, evaluating the function at x=-5
[tex]f(-5)=(5)*(-5)+40=-25+40=15[/tex]
