Determine the equivalent system for the given system of equations.

IK ITS NOT C!

4x - 5y = 2

10x - 21y = 10

A - 4x - 5y = 2

3x - y = 4

B - 4x - 5y = 2

24x - 47y = 22

C - 4x - 5y = 2

10x + 3y = 15

D - 4x - 5y = 2

14x + 26y = 12

If 0 is an acute angle and sin 0 = 1/2 then cos 0 =

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