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We have such system [tex] \left \{ {{y=4x-9} \atop {y=x-3}} \right. [/tex] We can take first equation and put value of y in terms of x into second eq, so y=x-3 4x-9=x-3 now we can solve it 4x-9=x-3 /-x both sides 3x-9=-3 /+9 both sides 3x=6 /:3 divide by 2 both sides x=2 --- its the result
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