y = x - 3
y = 3x - 5
Since the two expressions on the right are both equal to 'y', they're equal to each other.
x - 3 = 3x - 5
Subtract 'x' from each side:
-3 = 2x - 5
Add 5 to each side:
2 = 2x
Divide each side by 2:
x = 1
Return to the first original equation, and substitute (1) in place of 'x':
y = x - 3
y = 1 - 3 = -2
The point where the two lines intersect is (1, -2).
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3x5
95
5+5+5
The generalisation is that multiplication is Abelian (or commutative) for numbers.
3x5+4=19