exam Maths Puzzle Numerical Ability

Solve the system of linear equations by the substitution method. Then, state whether the system is independent, dependent, or inconsistent.
-x+7y=4
-x+7y=3

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exam Other Question
Prove that:
1 + cos A/ 1 - cos A = tanČA/(secA - 1)Č -4t - 2(7 - 3t)= -3t + 23 i can;t figure this out