You NEED to learn this! - UK Maths Olympiad

Today, we're venturing into the fascinating realm of exponential equations and solving this with substitution to turn them in to parametric equations!
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[@willdrunkenstein5367]

Doesn’t the assumption y = kx impose additional requirements on the values of x and y?

[@sanju_devi85]

I got it x,y = 2,4 the estimated without solving

[@devinanderson7615]

I thought the solution was x=y

[@PlatonAltei]

2⁴=4²