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Solve by the substitution method 15x-20y equals -1 15y equals 2 plus 5x?
Wiki User
∙ 14y ago
Given:
15x - 20y = -1
15y = 2 + 5x
Then:
15x -20(2 + 5x)/15 = -1
∴15x -40/15 - 100x/15 = -15/15
∴225x/15 - 100x/15 = 40/15 - 15/15
∴125x = 25
∴x = 1/5
Check:
15(1/5) - 20(1/5) = -1
∴3 - 4 = -1
∴-1 = -1
Wiki User
∙ 14y ago
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