Rozwiąz równanie .
a) 5x = 15 b) 4x = 0 c) x = y d) y = 2x + 2 e) a = 2b
x-y =2 2y + x = 8 4x - y = 9 2x + y = 6 a + 2b + 10
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a) 5x = 15 /5
x-y =2
x=3
x-y =2
3-y=2
-y=2-3
-y=-1/*(-1)
y=1
x=3
spr. x-y =2
3-1=2
2=2
b) 4x = 0/4
2y + x = 8
x=0
2y+x=8
2y+0=8
2y=8/2
y=4
x=0
spr,2y + x = 8
2*4+4=8
8=8
c) x = y
4x - y = 9
4y-y=9
3y=9/3
y=3
x=3
spr.x = y
3=3
d) y = 2x + 2
2x + y = 6
2x+(2x+2)=6
2x+2x+2=6
4x=6-2
4x=4/4
x=1
y = 2x + 2
y=2*1+2
y=2+2
y=4
x=1
spr. 2x + y = 6
2*1+4=6
2+4=6
6=6
e) a = 2b
a + 2b = 10
2b+2b=10
4b=10/4
b=2.5
a=2b
a=2*2.5
a=5
b=2.5
spr.a + 2b + 10
5+2*2.5=10
5+5=10
10=10
oto chodzi licze na naj
a)
5x = 15/:5
x-y = 2
x=3
3-y=2
-y=-1
y=1
b)
4x = 0/:4
2y + x = 8
x=0
2y+0=8
2y=8
y=4
c)
x = y
4x - y = 9
4y-y=9
3y=9
y=3
x=3
d)
y = 2x + 2
2x + y = 6
2x+2x+2=6
4x=4
x=1
y=2*1+2
y=2+2
y=4
e)
a = 2b
a + 2b = 10
2b+2b=10
4b=10
b=2,5
a=2*2,5
a=5