A sensor tracking the movement of a robotic probe in a research lab models the horizontal displacement xxx and vertical displacement yyy at time ttt using the parametric equations
x=7×6−t+3 x = 7 \times 6^{-t} + 3 x=7×6−t+3 y=4×6t−5 y = 4 \times 6^{t} - 5 y=4×6t−5Show that dydx=−47×62t\dfrac{dy}{dx} = -\dfrac{4}{7} \times 6^{2t}dxdy=−74×62t.
Find the Cartesian equation of the curve in the form xy+ax+by=cxy + ax + by = cxy+ax+by=c, where aaa, bbb and ccc are integers.
82 exam-style questions on WJEC A Level Maths 3.6.6 Differentiation (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.