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Without an equality sign and other information the details given can't be considered to be an equation.

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Q: What is the value of y in the equation 6.4x 2.8y 44.4 when x 3?
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What is the value of y when x is 4 and y is 6 4 x?

You already know the value of x is 4. To solve the value of y = 64x, mutlply 64 x 4. Hence, y = 64*4 = 256.


The sum of two numbers is 15 three times one of the numbers is 11 less than five times the other What are the numbers?

Set up a system of equations. Let the numbers be x, y. X + Y = 153X = 5Y-11 Solve the first equation for Y.Y = 15-XPlug it into the second equation.3X = 5(15-X) - 11And solve for X.3X = 75 - 5X - 113X = 64 - 5X8X = 64X = 8 Plug X back into the original first equation.8 + Y = 15Y = 7 X = 8, Y = 7


Use addition or substitution to find the value of x for this set of equations 4x plus 13y equals 40 4x plus 3y equals -40?

Try elimination.4X + 13Y = 40- 1(4X + 3Y = - 40)4X + 13Y = 40- 4X - 3Y = 40-----------------------add10Y = 80Y = 8-------------find X ( top equation )4X + 13(8) = 404X + 104 = 404X = - 64X = - 16----------------------check in both equations for consistency4(- 16) + 13(8) = 40- 64 + 104 = 4040 = 40-------------top checks4(- 16) + 3(8) = - 40- 64 + 24 = - 40- 40 = - 40-------------------both check and are consistentSo, X is,- 16 ( while Y is 8 )


Find the derivatives of all orders of the functions y x42-32x2-x?

y=x^42-32x^2-x y' = 42x^41 - 32(2)x - 1 y' = 42x^41 -64x-1


8x to the second power times 3x to the second power?

8x to the second power times 3x to the second power (8x)2 + (3x)2 = 64x2 + 9x2 = 73x2 is one possibility, except the problem called for multiplication which would make the answer 64x squared times 9x squared = 576x to the fourth power It could also be read this way: 8x squared times 3x squared equals 24x to the fourth power. I wish my computer would do those cool little twos.