keke6361
04.03.2021 •
Mathematics
This equation shows how the total number of hair bands Linda owns is related to the amount of money she spends on additional hair bands. h = 9d + 79 The variable d represents the amount of money she spends on additional hair bands, and the variable h represents the total number of hair bands she owns. How much money does Linda need to spend on new hair bands in order to own a total of 97 hair bands?
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Ответ:
4x+2y=10
y=2x-1
4x+2(2x-1)=10
4x+4x-2=10
8x=10+2
8x=12
8x÷8=10÷8
x=1,25
&
y=2x-1
=2(1.25)-1
=1.5
x+y=1.25+1.5
=2,75