Answer:
\(f(-5)=15\)
Step-by-step explanation:
We have a linear equation:
\(y=ax+b\)
Where:
\(a=Slope\\b=intercept\hspace{3}with\hspace{3}the\hspace{3}y\hspace{3}axis\)
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
\(f(-5)=(5)*(-5)+40=-25+40=15\)
