you have the equation:
y = 2x
in order to complete the table, proceed as follow:
for x=9
y = 2(9) = 18
for y=10, solve the equation for x and replace y:
x=y/2
x=10/2=5
for x=1
y = 2(1) = 2
Then, you have:
x | y
9 18
5 10
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