exam Maths Puzzle Numerical Ability

Solve the system by substitution.
x + 4y = -4
3x - 3y = -12

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exam Other Question

Solve equation on the interval 0<=Theta<2 Pie
cos(2theta)=2-2sin squared Theta
Show all solutions in radian or pie form (6 - i)/ (4+7i)

thank you