exam Maths Puzzle Numerical Ability

2x - 3y= 6

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exam Other Question

Solve the system using substitution or elimination:

3x+2y= -12
2x+y= -7
and
2x-4y= -2
4x+8y=0 hey,
could you please solve the following question, thanks,
The graph of function y= x^2 - kx + k + 8 touches the x-axis at one point. What
is the value of k?

I will be waiting for the solution,
and thanks again,