Rozwiąż układ równań metodą podstawiania.
a) 2x-3y=7
4x+1/2=1
b) 4x-6y=0
2/3x+1/2y=1/3
c) 3x+2y=-3
7x+2y= 1
d) 3x+0,25y=-1
5x+2y= 11
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a) 2x-3y=7
4x+1/2=1 | - 1/2 |*2
2x -3y=7
8x=1 | /8
2x- 3y=7 | - 2x
x= 0,125
x=0,125
-3y = 7 - 2*0,125
x=0,125
-3y = 7 - 0,25
x=0,125
-3y = 6,75
y= - 2,25
x= 0,125
b) 4x - 6y =0
2/3x + 1/2y = 1/3 |*6
4x-6y=0
4x + 3y = 2 |-3y | /4
4x-6y = 0
x= 1/2 - 3/4y
x= 1/2 - 3/4y
4( 1/2 - 3/4y) - 6y = 0
x= 1/2 - 3/4y
2- 3y - 6y = 0 | -2
x= 1/2 - 3/4y
-9y = -2 | /9 | *(-1)
y= 2/9
x= 1/2 - 3/4 * 2/9
y= 2/9
x= 3/6 - 1/6
y= 2/9
x= 2/6
c) 3x + 2y = -3
7x+2y=1 | - 7x | /2
y = 1/2 - 3,5x
3x+ 2(1/2 - 3,5x) = -3
y = 1/2 - 3,5x
3x+ 1 -7x = -3
y= 1/2 - 3,5x
-4x = -4 |/4
x= 1
y= 1/2 - 3,5*1
x=1
y= -3
d) 3x + 0,25y = -1 | - 3x | *4
5x+ 2y = 11
y = -4 - 12x
5x + 2( -4 - 12x)= 11
y= -4 - 12x
5x - 8 -24x = 11 | + 8
y= -4 - 12x
-19x= 19
x= -1
y= -4 - 12*(-1)
x= -1
y= 8