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7. Which method would be the most efficient to solve the system? y = 1/2x, 2x + 3y = 28
A) graphing
B) substitution
C) elimination
D) distributive
2x + 3y = 28 2x + 3(¹/₂x) = 28 2x + 1¹/₂x = 28 3¹/₂x = 28 3¹/₂ 3¹/₂ x = 8 y = ¹/₂x y = ¹/₂(8) y = 4 (x, y) = (8, 4) The method would be a substitution method (the answer is B).
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