A park has a ginkgo tree, a dogwood tree, and 2 blue spruce trees. The blue spruce trees are 8 years old. The ginkgo tree is 2 years less than three times the age of the dogwood tree. The ginkgo tree is also half the sum of the ages of the dogwood tree and both of the blue spruce trees. Write and solve an equation to find the ages of the ginkgo and dogwood trees.

The equation is x = 5 ⇒ F

The slope is undefined ⇒ C

Step-by-step explanation:

* Lets talk about the slopes of the line and the relation between

 the parallel lines and the perpendicular lines

- If the two lines are parallel, then their slopes are equal

- If the two lines perpendicular, then the product of their slopes = -1

 that meas one of them is additive inverse and multiplicative

 inverse of the other

- If the line parallel to x-axis, then all the points on that line

 have the same y-coordinates (a , b) (horizontal line)

∵ The slope = (y2 - y1)/(x2 - x1)

∴ Its slope = 0 because (y2 - y1) = 0

* Its equation is y = b

- If the line parallel to y-axis, then all the points on that line

 have the same x-coordinates (a , b) (vertical line)

∵ The slope = (y2 - y1)/(x2 - x1)

∴ Its slope = undefined because (x2 - x1) = 0

* Its equation is x = a

* Now look to the problem

- The line is ⊥ x-axis means it is parallel to y-axis (vertical line)

∴ Its slope = undefined

∵ It passes through point (5 , -3)

∴ Its equation is x = 5

* The equation is x = 5

* The slope is undefined