13 +2y=9xand 3y=7x by substitution
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3y=7x
y=7x/3
13+2y=9x
13+2(7x/3)=9x
39+14x=27x
39=13x
x=3
y=7x/3
=7*3/3
y=7
y=7x/3
13+2y=9x
13+2(7x/3)=9x
39+14x=27x
39=13x
x=3
y=7x/3
=7*3/3
y=7
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