exam Maths Puzzle Numerical Ability

Solve each system by the substitution method. Determine whether the equations are independent, dependent, or inconsistent.


Problem #26

y = x + 4
3y - 5x = 6

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exam Other Question

cos 225 as function of a positve acute angle less than 45.

The reference angel of cos 225 is -cos 45 but that is not less than 45 nor is it positve.
Please help....thanks!

Solve: X is greater than or equal to 10 or X is less than or equal to 10.

Is this the answer? (-infinity,10) union (10, infinity)....Please explain, I think I understand a little, but not quite sure.