exam Maths Puzzle Numerical Ability

Need to solve equation 3x-1=5x-y and graph results.

This is my attempt:

3x-1-5x = 5x-y-5x
-2x-1 = -y, do I do anything else or is this the answer?

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exam Other Question
can someone please help me?

1. Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of th Graph the following including the axis of symmetry, identify the axis of symmetry, and create a suitable table of values x on one side and y on the other.
y = 2x^2