book Maths Puzzle Numerical Ability

Solve the following system by using either addition or substitution. If a unique solution
does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3

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book Other Question

Find the axis of symetry (X-coordinate) and vertex of the parabola y = 6 + 6x - 1/3xSQUARED. the x of 1/3x is squared Please help me answer the question: Find the center of the circle with the equation {{{x^2+y^2-4x+6y+1=0}}}