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30.11.2019 •
Mathematics
Phyllis paid $408 for new wall-to-wall carpeting in her living room. the carpeting was $12 per square yard, plus a $120 installation charge. how many square yards did she buy?
a. 26 sq yd
b. 34 sq yd
c. 44 sq yd
d. 24 sq yd
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Ответ:
y=12x+120
y=12(26)+120
y=312+120
y=432 (No)
B.)34
y=12x+120
y=12(34)+120
y=408+120
y=528 (No)
C.)44
y=12(44)+120
y=528+120
y=648 (No)
D.)24
y=12x+120
y=12(24)+120
y=288+120
y=408 (Yes)
The other way is setting it equal to...
12x+120=408
Isolate the variable...
12x+120=408
-120 -120
12x=288
x=24
Thus (D) is you answer!
Hope this helps!
Ответ: