Uklady równań metodą podstawiania:
a. 3x+y=5
2x-y=0
b. 2x-y=5
x+y=4
c. -x-y=-6
-x+y=2
d. 4x-5y=-4
-2x+3y=1,1
e. -2x+y=0
3x-3y=1
f. 3x-2y=-12
2x-5y=-19
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a. 3x=5-y
y=-2x
3x=5+2x => 3x-2x=5
y= -2x x=5
x=5
y=-2 * 5
x=5
y= -10
b. 2x-y=5
x+y = 4
2x= 5+y => 2x= 5+4-x
y=4-x 3x = 9
x=3
x=3
y=4-3 = 1
c. -x-y = -6
-x+y=2
-x= -6 + y /:(-1)
y= 2+x
x = 6-y => x= 6-2+x
2x = 4
x=2
y = 2+2=4
d. 4x-5y=-4
-2x+3y = 1,1
4x = -4 + 5y
3y = 1,1 +2x /:3
4x = -4 +5y => 4x = -4 + 5 (0,36 + 2/3x)
y = 0,36 + 2/3 x 4x = -4 + 1,8 +10/3 x
4x - 10/3 x = -2,2
y = 0,36 + 2/3 *(-3,3) 2/3 x = - 22/10 /:2/3
y = 0,36 - 22/10 x = - 3,3
y = 7/5 = 1,4
e. -2x+y = 0
3x-3y = 1
-2x = -y
-3y = 1 - 3x / :(-3)
-2x= -y
y = -1/3 + x
-2x = -y => -2x = - 1/3 + x
-2x - x = -1/3
-3x = -1/3 / :(-3)
x = 1/9
y = -1/3 + 1/9
y = - 3/9 + 1/9
y = -2/9
f. 3x - 2y = -12
2x - 5y = -19
3x = -12 + 2y /: 3
-5y = -19 -2x
x = -4 +2/3 y
-5y = -4 + 2/3*(-4 +2/3x) => -5y = -4 - 8/3 + 2/3 x
-2/3 x = -20/3 + 5y /:(-2/3)
x = 10 +5y
10 + 5y = -4 + 2/3y
5y - 2/3y = -4 -10
13/3 y = -14 / :(13/3)
y = 3 i 3/13