Verified Answer :

We have such system
\(\left \{ {{y=4x-9} \atop {y=x-3}} \right.\)
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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