To solve by substitution, you can substitute y = x - 4 into the second equation:
y = 4x - 10
x - 4 = 4x - 10 (substitute x-4 in for y)
-4 = 3x - 10 (subtract x from both sides)
6 = 3x (Add 10 to both sides)
x = 2 (Divide by 3 on both sides)
And you're done! :)
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