Answer:
hight mmm or it's depents on the speed of roller coaster
You can multiply either the top or bottom equation by -1 so lets say you apply it to the bottom equation it’ll look like this:
-9x + 9y = 18
6x - 9y = 12
then the +9y and -9y will cancel out
-9x = 18
6x =12
then you add the two equations together
-3x = 30
divide both sides by -3
x = -10
<span>−1.2z − 8.2 > −9.7</span>
−1.2z > - 1.5
z < 1.25
