exam Maths Puzzle Numerical Ability

please help : Solve the system by graphing and then get an exact solution by using either substitution or elimination :

2x - y = -1

6x + 3y = 0

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exam Other Question

Given: angle 1 is congruent to angle 4
Prove: angle 2 is congruent to angle 3 Show your steps in simplifying the radical expression. Make sure to follow the pattern shown in the examples 3 cubed of square root of 45