The pair of equations x+y=0 and x+y = -7 has ____ solution (s).
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2 solutions x value and the y value
do it by elimation method easy step
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The pair of equations x+y=0 and x+y = -7 has no solution.
a1 /a2 = b1/b2 ≠ c1/c2, then the lines are parallel
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