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31.01.2021 •
Mathematics
X + y = 5.5
x + 2y = 7
solve the equation using elmeniation
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Ответ:
y=1.5
x=4
Step-by-step explanation:
x=5.5-y
x+2y=7
(5.5-y)+2y=7
5.5-y+2y=7
y=7-5.5
y=1.5
x+1.5=5.5
x=5.5-1.5
x=4
Ответ:
75*x=42
multiply both sides by 100 and divide both by 75
x=42*100/75
x=56
42*100divided by 75
52:80*100=
(52*100):80=
5200:80=65