The approximate linear equation of the graph below is y = 4 x + 55.  Which interpretation of the y-intercept is correct?

Solve the system of equations and give a geometrical interpretation of the result.
x + y + z = 6
2x + y − 3z = -5
4x − 5y + z = −3

(a) Find an approximation to the integral using a Riemann sum with right endpoints and.

(b) Draw a diagram like Figure 3 to illustrate the approximation in part (a).

(c) Use Theorem 4 to evaluate.

(d) Interpret the integral in part (c) as a difference of areas and illustrate with a diagram like Figure 4.

If the graph below has the intercepts  and . Determine  and .