Mark M.
answered • 02/02/15
Mathematics Teacher - NCLB Highly Qualified
2x + 3y = 15.5
x + y = 6 ⇒ y = -x + 6
2x + 3(-x + 6) = 15.5
2x - 3x + 18 = 15.5
-x = -2.5
x = 2.5
y = 3.5
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