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faizanaj1192
28.10.2020 •
Mathematics
If x=21 then y=49. What is the value of x when y=56?
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Ответ:
24
Step-by-step explanation:
set them up as a fraction.
21/49=x/56
cross multiply: 21*56=49x
1176=49x
divide both sides by 49
x=24
Ответ:
28
Step-by-step explanation:
notice that when x=21 thats 3x7=21
then when y=49 thats 7x7
so when y=56 that's 8x7
notice there is a patter of 7 being used? there are probably a lot of other patterns that would also work.. but. if your class is working on multiplying by 7 , then this is probably the right pattern.
from the above pattern, then,
x=4x7 when y=56
x=28
Ответ:
6
Step-by-step explanation:
-X+11=-2X-7
11=3X-7
18=3X
18/3= 6