a+9b=21,a+4b=6

using subtraction method need to find point intercept on a graph.
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1 Answer

line 1: x+9y=21

line 2: x+4y=6

line1 -line2=(9y-4y)=(21-6)

5y=15

y=3

from line2...x=6-4y=6-12

x=-6
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