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Add sides 5


Subtract sides 2x


Divide sides by 4


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CHECK :



Thus the solution is correct....
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The value of given expression when x=-4 and y=4 is 1250.
The expression is missing in the question which is
.
We have to solve it for x= -4 and y = 4.
Now putting the value of x and y we get,



Hence the value of given expression when x=-4 and y=4 is 1250.
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Yes, because the sample is random. If she had chosen the participants in any way other than randomly, it would not be representative of her entire school.
Y = 4x - 1
// Plug this in for variable y in equation [1]
[1] 20x - 5•(4x-1) = 5
[1] 0 = 0 => Infinitely many solutions