exam Maths Puzzle Numerical Ability

Below, the picture represents two parallel lines like the ones of windshields wipers in a car. The slashes represent the parallel lines as best as possible.

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I need your help with this please.
Solve the following system by substitution. If a unique solution does not exist, state whether the system is inconsistent or dependent. 5x - 2y = -5 and y - 5x = 3 The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes), as shown in the figure below. The remaining credit