Question

Sistemas de ecuaciones puedes resolver por el método que prefieras 
a.-----------------------
 * 4x+3(y-1)=5
 * 3(y-1)=2x-7
b.------------------------
 * 2(x-1)-6(y+2)=4
 * 4x-3(5y-1)=0

Answer 1

4x+3(y-1)=5...........4x+3y-3=5....4x+3y=5+3......4x+3y=8
 3(y-1)=2x-7.........3y-3=2x-7......-2x+3y=-7+3.....-2x+3y=-4

 1(4x+3y=8)............4x+3y=8
-1(-2x+3y=-4)..........2x-3y=4 
                              6x=12........x=12/6....x=2

si x=2.......4x+3y=8.....4(2)+3y=8....8+3y=8...3y=8-8....3y=0.....y=0

respuesta x=2    y=0

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 2(x-1)-6(y+2)=4......2x-2-6y-12=4....2x-6y-14=4....2x-6y=4+14......2x-6y=18
  4x-3(5y-1)=0.......4x-15y+3=0...................................................4x-15y=-3
hacemos sustitucion
2x-6y=18........2x=6y+18......x=6y+18 ......x=3y+9
                                                 2
4x-15y=-3.....4(3y+9)-15y=-3....12y+36-15y=-3....12y-15y=-3-36
-3y=-39........y=-39/-3........y=13

si y=13........2x-6y=18.....2x-6(13)=18....2x-78=18....2x=18+78.....2x=96
x=96/2...........x=48
respuesta x=48       y=13