The Student Room Group

modelling with parametric equations

I don't understand this question and I'm a bit confused about the 75 m wide distance. can someone help me please

A river flows from north to south.

The position at time t seconds of a rowing boat crossing the river from west to east is modelled by the parametric equations x=0.9t
m, y=−3.2t
m where x
is the distance travelled east and y
is the distance travelled north. Given that the river is 75 m wide,

(a) Find the time taken to get to the other side

(b) Find the distance the boat has been moved off-course due to the current
Reply 1
Original post by Noname60
I don't understand this question and I'm a bit confused about the 75 m wide distance. can someone help me please
A river flows from north to south.
The position at time t seconds of a rowing boat crossing the river from west to east is modelled by the parametric equations x=0.9t
m, y=−3.2t
m where x
is the distance travelled east and y
is the distance travelled north. Given that the river is 75 m wide,
(a) Find the time taken to get to the other side
(b) Find the distance the boat has been moved off-course due to the current

The river is 75 m wide so the boat must travel this distance east-west (x coordinate) to cross the river.

Quick Reply