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mikaylarichardson96
06.07.2019 •
Mathematics
Jack bought 34 stamps at the post office.red stamps were $0.33 each and the blue stamps were $0.50 each.if the total cost of the stamps was 12.75,how many of each type did he buy?
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Ответ:
And b= blue stamps
r+b=34
0.33r+0.5b=12.75
Solve by substitution, isolate the variable r
r=-b+34
Substitute into second equation
0.33(-b+34)+0.5b=12.75
Distribute
-0.33b+11.22+0.5b=12.75
Collect like terms and isolate the variable
0.17b=1.53
Divide by 0.17
b=9
Subtract from 34 to get the number of red stamps
34-9=25
He brought 9 blue stamps and 25 red stamps
Ответ:
-6/-11
Step-by-step explanation:
First we find the gradient.
Which is defined by the formula, y2-y1/x2-x1
In the coordinates given, y2= -1 y1= 5 x2= -4 x1=7
-1-5/-4-7 = -6.75 (this is the slope / gradient)
Therefore it is -6/-11