Modeling with Linear Functions · Exercise 12

Find the area of a parallelogram bounded by the x-axis, the line $g\left(x\right)=2,$ the line $f\left(x\right)=3x,$ and the line parallel to $f\left(x\right)$ passing through $\left(6,1\right).$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §4.2 Modeling with Linear Functions · Exercise 12