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a) y=x+3
2x+y=9
b) x-4y=15
y=4x
c) y=-2x-1
x=y+7
d) -3x=2y
y=1-x
y = x+3
2x+y = 9
2x+x+3 = 9
3x = 9-3
3x = 6 |:3
x = 2
y = 2+3
y = 5
b)
x-4y = 15
y = 4x
x-4(4x) = 15
x-16-4x = 15
-3x = 15+16
-3x = 31 |:(-3)
x = -10⅓
y = 4*-10⅓
y = -41⅓
c)
y = -2x-1
x = y+7
y = -2(y+7)-1
y = -2y-14-1
y+2y = -14-1
3y = -15 |:3
y = -5
x = -5+7
d)
-3x = 2y
y = 1-x
-3x = 2(1-x)
-3x = 2-2x
-3x+2x = 2
-x = 2 |:(-1)
x = -2
y = 1-(-2)
y = 1+2
y = 3
Liczę na naj i pozdrawiam
RaVVi
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y = x+3
2x+y = 9
y = x+3
2x+x+3 = 9
y = x+3
3x = 9-3
y = x+3
3x = 6 |:3
y = x+3
x = 2
y = 2+3
x = 2
y = 5
x = 2
b)
x-4y = 15
y = 4x
x-4(4x) = 15
y = 4x
x-16-4x = 15
y = 4x
-3x = 15+16
y = 4x
-3x = 31 |:(-3)
y = 4x
x = -10⅓
y = 4x
x = -10⅓
y = 4*-10⅓
x = -10⅓
y = -41⅓
c)
y = -2x-1
x = y+7
y = -2(y+7)-1
x = y+7
y = -2y-14-1
x = y+7
y+2y = -14-1
x = y+7
3y = -15 |:3
x = y+7
y = -5
x = y+7
y = -5
x = -5+7
y = -5
x = 2
d)
-3x = 2y
y = 1-x
-3x = 2(1-x)
y = 1-x
-3x = 2-2x
y = 1-x
-3x+2x = 2
y = 1-x
-x = 2 |:(-1)
y = 1-x
x = -2
y = 1-(-2)
x = -2
y = 1+2
x = -2
y = 3
Liczę na naj i pozdrawiam
RaVVi