Question

find the value of y when x equals -20 x+3y=7

Answer 1

x = -20
.: -20 + 3y =7
3y = 7+20
y = 27/3 = 9

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Answer 2

if x=-20

then,

by the problem;

x+3y=7

-20+3y=7

3y=7+20

3y=27

y=27/3

y=9

∴y=9