exam Maths Puzzle Numerical Ability

Please help me on how to do this problem:
Determine the constant k so that ( -2,3) will satisfy the equation - kx-4y= -k
PLEASE HELP ME!!!!

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exam Other Question

I HAVE $1.00 IN MY POCKET IT IS ALL IN COINS.
TOTAL COINS IS 50.
I HAVE 50 COINS IN MY POCKET WHICH IS EQUAL TO $1.00. WHAT IS THE BREAK DOWN OF COINS THAT I HAVE? HOW MANY OF EACH ? Hi,

I need help how would solve the following

6 = -2x/4

Thank you for your help.

Craid