The average weight of a package of rolled oats is supposed to be at least 18 ounces. A sample of 18 packages shows a mean of 17.
1 answer:
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Answer:
Step-by-step explanation:
(a)
Given the system of equation:
.....[1]
.....[2]
Multiply equation [2] by -2 we get;
......[3]
Add equation [1] and [3] to eliminate y and solve for x we have;
Combine like terms;
Substitute the value of x in [2] we get;
2(-8)-y =1
-16-y = 1
Add 16 both sides we get;
-y = 17
or
y =-17
Answer; Solution for the given system of equation is (-8, -17)
Verify:
Substitute the value of x = -8 and y = -17 in the system of equation;
5x -2y = -6
5(-8)-2(-17) = -6
-40+34 = -6
-6 = -6 True
2x-y =1
2(-8)-(-17) = 1
-16+17 = 1
1 = 1 True.
(b)
Given the system of equation:
.....[1]
.....[2]
Multiply equation [2] by 3 and equation [1] by 2 we get;
......[3]
......[4]
Add equation [3] and [4] to eliminate y and solve for x we have;
Combine like terms;
Divide both sides by 19 we get
x = 48
Substitute the value of x in [2] we get;
5(48)-2y=16
240 -2y = 16
Subtract 240 from both sides we get;
-2y =-224
Divide both sides by -2 we get
y =112
Answer: Solution for the given system of equation is (48, 112)
Verify:
Substitute the value of x = 48 and y = 112 in the system of equation;
true
16 = 16 true