Oblicz równanie, a następnie sprawdź lewą i prawą stronę tego równania.
a) 5=3+7x
b)3x+5=2x
a)
5=3+7x
-7x = 3-5
-7x = -2 /:(-7
x = 2/7
spr
L=5
P=3+7*2/7 = 3+14/7 = 3+2 = 5
L=P
b)
3x+5=2x
3x-2x = -5
x = -5
L = 3*(-5)+5 = -15+5 = -10
P = 2*(-5) = -10
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a)
5=3+7x
-7x = 3-5
-7x = -2 /:(-7
x = 2/7
spr
L=5
P=3+7*2/7 = 3+14/7 = 3+2 = 5
L=P
b)
3x+5=2x
3x-2x = -5
x = -5
L = 3*(-5)+5 = -15+5 = -10
P = 2*(-5) = -10
L=P