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olya-2409 [2.1K]
3 years ago
11

Solve the system of equation by the addition method x-6y=19 and -x+2y =-31

SAT
1 answer:
Tomtit [17]3 years ago
7 0
X-6y=19
-x+2y=-31
________
0-4y= -12
-4y=-12
y= -12/-4
y=3
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7 0
2 years ago
Adam can clean a room in 3 hours. If his sister Maria helps, they can clean it in 2 2/5 hours. How long will it take Maria to do
Contact [7]
Adam can clean a room in 3 hours. If his sister Maria helps, they can clean it in 225 hours. How long will it take Maria to do the job alone?
2 2 = 12 Together time, 2 2 , needs to be converted to fraction 555
Adan:3,Maria:x,Total: 5 Clearlystatetimesforeachandtotal,usingxforMaria 12
1+1= 5 Usingreciprocals,addtheindividualtimesgivestotal 3 x 12
1

1(12x) + 1(12x) = 5(12x) 3 x 12
4x+12=5x −4x −4x 12=x It takes Maria 12 hours
Multiply each term by LCD of 12x
Reduce each fraction
Move variables to one side, subtracting 4x Our solution for x



Answer is - 12 hours
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2 years ago
a group of 625 students has a mean age of 15.8 years with a standard deviation of 1.2 years. the ages are normally distributed.
valkas [14]

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