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solve the systems of equation: First : 4x-2y = 2 Second: y = -4x-7

Should i solve by using substitution, elimination or multiply then use elimination?

Try adding them. Add up the left sides and the right sides (after rearranging the second equation) the x term will drop out, giving you
4x -2y = 2
-4x-y = 7
-3y = 9
y = -3
For x, substitute y=-3 into the first equation
x = (1/4)(2 +2y) = -1

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