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4x + 2y = 6
At the y-intercept, x=0 .-2y = 18y = -9
6x-2x-6xy-2x-2y4x-2y=2x-2y-14xy
Substitution is used in Systems of Linear Equations. When you have two equations, such as y=3x+1 and 2y+5=9x+1, then substitution can be used. 2y could be substituted with 2(3x+1). You would have now the equation 6x+2=9x-1, which is more solvable.
If you mean: 2y = -4x-12 then y = -2x-6 and -6 is the y intercept