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15x - 20y = -1

15y = 2 + 5x


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


15(1/5) - 20(1/5) = -1

∴3 - 4 = -1

∴-1 = -1

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Q: Solve by the substitution method 15x-20y equals -1 15y equals 2 plus 5x?
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