# how to define (independent) the scale of x-axis and y-axis?

I want to compare 2 plots, and view that 4 lines are exactly the same tangent.

So I would like to view 2 images with the same scale in the y-axis and the same scale in the x-axis

How can I do this. AspectRatio it´s not a solution for me becasue is a ratio for the image not for the scale

Expr1 = -alfa + 1;
Expr2 = -2 alfa + 2;
Expr3 = 5 alfa;
Expr4 = -alfa + 1;

Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
BaseStyle -> AbsoluteThickness[4],
PlotLegends ->
LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]],
AspectRatio -> 1]


If you plot this one, the same lines moved up/down, you can see that the sacale of y-axis is diferent because the y-range is longer.

Expr1 = -alfa - 2;
Expr2 = -2 alfa + 4;
Expr3 = 5 alfa;
Expr4 = -alfa - 1;

Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
BaseStyle -> AbsoluteThickness[4],
PlotLegends ->
LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]],
AspectRatio -> 1]


I want to maintain the same scale in the y-axis

-

Expr1 = -alfa + 1;
Expr2 = -2 alfa + 2;
Expr3 = 5 alfa;
Expr4 = -alfa + 1;

p1 = Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
BaseStyle -> AbsoluteThickness[4],
PlotLegends ->
LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]],
PlotRange -> {Automatic, {-5, 5}},
AspectRatio -> 1];

Expr1 = -alfa - 2;
Expr2 = -2 alfa + 4;
Expr3 = 5 alfa;
Expr4 = -alfa - 1;

p2 = Plot[{Expr1, Expr2, Expr3, Expr4}, {alfa, 0, 1},
BaseStyle -> AbsoluteThickness[4],
PlotLegends ->
LineLegend["Expressions", BaseStyle -> AbsoluteThickness[4]],
PlotRange -> {Automatic, {-5, 5}},
AspectRatio -> 1];

Grid[{{p1, p2}}]


-
perfect That´s what I wanted, but... do you know any way to obtain as independent plots?, without a grid. Because I want to save the legends with the rigth bracket option SAVE AS... – Mika Ike Jul 16 '14 at 18:39
@mika Ike@ Just remove the semicolons behind the definitions of p1 and p2. Now p1 and p2 pop up and you can save them indepently. – eldo Jul 16 '14 at 18:49
Yes :-) sorry!! – Mika Ike Jul 16 '14 at 19:02