exam Maths Puzzle Numerical Ability

Can you please help me solve using the elimination method?

8x - 5y = 8
2x + 3y = 2

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exam Other Question

Mean equal to 15 and standard deviation equal to 5. Find the probabilities associated with getting:
a. A 15 or above
b. Between a 15 and an 18
c. A 13 and above I am having a problem solving this problem:
For the equation x - the square root of x = 0 , perform the following:
Solve for all values of x that satisfies the equation
Thanks for your help.