exam Maths Puzzle Numerical Ability

i need help sloving this system if equation by substitution
2x-2y=4
x+3y=1

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exam Other Question

-4^0-8^0 Simplify expression.

My answer is -1-1=-2. Is this the correct answer? Graph the following linear equation:

y=-2x-1

Any help with this one would be great. Thank you so much.