exam Maths Puzzle Numerical Ability

if 7y-6 = 5y-4 then what is y??

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exam Other Question

solve the system using matrices. Use Gaussian elimination with back-substitution or Gauss-Jordan elimination:

w+x+y+z=5
w+2x-y-2z=-1
w-3x-3y-z=-1
2w-x+2y-z=-2 Lee received an $8500 loan with interest at 9% for 126 days on May 4. Lee made a payment of $4000 on July 2.
A) what is the day of maturity of the loan?
B) how much did she owe