book Maths Puzzle Numerical Ability

Am doing this right? Is the ordered pair 5,-4 the answer for the following question
which ordered pair is a solution to 3x - 4y = -1
thanks for your help

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book Other Question

The perimeters of a square and an equilateral triangle are equal. If the area of the square is 5.76 square centimeters, what is the perimeter of the triangle? Kathy had a party. Everyone at the party shook hands with everyone else.
How many people were at the party if there 78 handshakes?