book Maths Puzzle Numerical Ability

When choosing what a graph represents how would I do this problem... y=-2x=3?

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book Other Question

Sorry but I forgot to add something!

{{{ 0.419 = 1sqrt(1-(v^2/c^2)) }}}

c is known to be the speed of light in a vacuum: 3.00E8
need to find the value of v.

Thank you.
x^4-3x^2+2=0