What is the substitution
3x-5y=11;x=3y+1
2 answers:
3x-5y=11 ------- 1
x=3y+1――――2
from 2 make x subject of the formula
x=3y+1――――3
so put (3y+1)for x in 1
3(3y+1)-5y=11
9y+3-5y=11
4y+3=11
4y=11-3
4y=8
divide both side by 4
y=2――――4
put 2 for y in 3
x=3y+1
x=3(2)+1
x =7
Substitute 3x+1 for x. Then solve from there
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Answer: Length = 42ft Width = 21ft
Step-by-step explanation:
Let "w" be width
W = 21ft
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L = 42ft
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=126