exam Maths Puzzle Numerical Ability

Translate the following statement into an algebraic equaion. Let x represent the number. 9 less than 10 times a number is 7 times that same number.

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exam Other Question

I am having trouble with Cramer's rule can someone help. This problem is from a homework sheet.
Use Cramer's rule to solve the system.
2.) 2x + 4y= 42
2x + 3y= 36 Trigonometry Identities

Prove the identity is true

1/cosx - cosx = sinx tanx