Question

3x - 5y = 30, x = 15, y = ?​

Answer 1

Answer:

-15+30=-5y

15=-5y

y=-13

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Answer 2

3x-5y=30
3(15)-5y=30
45-5y=30
-5y=30-45
-5y=-15
5y=15 (both minus signs get cancelled to each other)
y=15/5
y=3