pcruznoel6624
26.03.2020 •
Mathematics
A bag contains purple marbles and red marbles, 34 in total. The number of purple marbles is 8 less than 5 times the number of red marbles. How many purple marbles are there?
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Ответ:
27 purple marbles
Step-by-step explanation:
Let p = purple marbles
r= red marbles
p = 5r-8
p+r = 34
Replace p in the second equation with 5r-8 from the first equation
p+r = 34
5r-8 +r = 34
Combine like terms
6r -8 = 34
Add 8 to each side
6r-8+8 = 34+8
6r = 42
Divide each side by 6
6r/6 = 42/6
r= 7
We want to find p
p+r = 34
p+7 = 34
Subtract 7 from each side
p+7-7 = 34-7
p =27
Ответ: