The angle of elevation and the angle of depression are the same. (They are alternate interior angles between the parallel lines of the ground and "horizontal.")
5(x -2) = x +14
5x -10 = x +14 . . . . . . . eliminate parentheses
4x = 24 . . . . . . . . . . . . add 10-x
x = 6
The angles of elevation and depression are both (6+14)° = 20°.
The solution to the system is (2,-1)
To make sure plug in the ordered pair into the system of equations
-2(2) - 3(-1) = -1
-4 - (-3) = -1
-1 = -1
3(2) + 6(-1) = 0
6 + -6 = 0
0 = 0
This ordered pair works and is your answer
(2,-1)
To work out how much Luz earns, you simply have to follow 400/40=10, so
she earns $10/hour. We can therefore establish that if she works for 6
hours, she'll earn $60.
What lesson and chapter is this?
to write decimal as a percent, multiply by 100
so 0.78 *100 = 78%