exam Maths Puzzle Numerical Ability

How would I solve this system by graphing, and what would be the coordinates?
3x + y = 6
3x = y = 0

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exam Other Question

The area of triangle ABC is 20 square units. If angle A = 130o and b = 6, find the value of c. May I have some help with the following equation?

Find all real solutions of the equation.

x^8 + 15x^4=16