Mathematics : asked on 0139236
 24.06.2022

x+y=9.0 0.50x+0.20y=3.15 Find the values of x and y.

. 9

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07.01.2023, solved by verified expert

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Mathematics
Step-by-step answer
P Answered by PhD
x+y=9 \\
0.5x+0.2y=3.15 \ \ \ |\times (-2) \\ \\
x+y=9 \\
\underline{-x-0.4y=-6.3} \\
y-0.4y=9-6.3 \\
0.6y=2.7 \\
y=\frac{2.7}{0.6} \\
y=\frac{27}{6} \\
y=\frac{24}{6}+\frac{3}{6} \\
y=4\frac{1}{2} \\ \\
x+y=9 \\
x+4 \frac{1}{2}=9 \\
x=9-4\frac{1}{2} \\
x=4\frac{1}{2} \\ \\
(x,y)=(4\frac{1}{2},4\frac{1}{2})

Mathematics
Step-by-step answer
P Answered by PhD
x+y=9 \\
0.5x+0.2y=3.15 \ \ \ |\times (-2) \\ \\
x+y=9 \\
\underline{-x-0.4y=-6.3} \\
y-0.4y=9-6.3 \\
0.6y=2.7 \\
y=\frac{2.7}{0.6} \\
y=\frac{27}{6} \\
y=\frac{24}{6}+\frac{3}{6} \\
y=4\frac{1}{2} \\ \\
x+y=9 \\
x+4 \frac{1}{2}=9 \\
x=9-4\frac{1}{2} \\
x=4\frac{1}{2} \\ \\
(x,y)=(4\frac{1}{2},4\frac{1}{2})

Mathematics
Step-by-step answer
P Answered by PhD

SI=(P*R*T)/100

P=2000

R=1.5

T=6

SI=(2000*1.5*6)/100

=(2000*9)/100

=180

Neil will earn interest of 180

Mathematics
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P Answered by PhD

Cost of 7 gallons=$24.50

Cost of 1 gallon=24.50/7=3.5

Cost of 15 gallons=15*3.5=52.5

Cost of 15 gallons will be $52.5

Mathematics
Step-by-step answer
P Answered by PhD

For 1 flavor there are 9 topping

Therefore, for 5 different flavors there will be 5*9 choices

No of choices= 5*9

=45 

Mathematics
Step-by-step answer
P Answered by PhD

y=2x+15

where y=Value of coin

x=Age in years

Value of coin after 19 years=2*19+15

=$53

Therefore, Value after 19 years=$53

Mathematics
Step-by-step answer
P Answered by PhD
The answer is in the image 

The answer is in the image 

Mathematics
Step-by-step answer
P Answered by PhD

The answer is in the image 

The answer is in the image 
Mathematics
Step-by-step answer
P Answered by PhD

Salesperson will make 6% of 1800

=(6/100)*1800

=108

Salesperson will make $108 in $1800 sales

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