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julian1260
05.10.2019 •
Mathematics
What is the answer for chris' age and mary's age?
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Ответ:
M = 3C-4
M-3=C+9 --> M=C+12
3C-4=C+12
2C=16
C=8
M=3C-4 --> C=8
M=3(8)-4
M=24-4
M=20
Mary is 20, and Chris is 8
Ответ:
c=chris's age
m is 4 younger than 3 times chris
m=-4+3c
m=3c-4
mary's age 3 years ago (m-3) is equal to chris age in 9 years (c+9), find c and m
m-3=c+9
we got
m=3c-4
sub 3c-4 for m in other eqution
3c-4-3=c+9
3c-7=c+9
minus c both sides
2c-7=9
add 7 to both sides
2c=16
divide both sides by 2
c=8
sub back
m=3c-4
m=3(8)-4
m=24-4
m=20
mary=20
chris=8
Ответ:
Step-by-step explanation:
PQ=RS
x-1=3x-7
-2x=-6
x=3
So the length of PS is
x-1+x+3x-7
5x-8, since x=3
5(3)-8
15-8
PS=7