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k0ka [10]
3 years ago
8

What is the value of y when y = 4x - 1 and x = 7/2

Mathematics
1 answer:
babunello [35]3 years ago
7 0
The answer to y= 4x- 1 is 13. substitute 7/2 at x and do 4 times 7/2 minus 1.
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Can someone please help me ASAP
charle [14.2K]

Answer:

(4,12)

(-1,-3)

Step-by-step explanation:

x^2 - y = 4

y = 3x

Use substitution.  Substitute 3x for y in the first equation

x^2 - (3x) = 4

x^2 -3x =4

Subtract 4 from each side

x^2 -3x -4 = 4-4

x^2 -3x-4 =0

Factor

(x-4) (x+1) =0

Using the zero product property

x-4 =0  x+1 =0

x=4   x=-1

Now to find y for each x solution

x=4

y =3x = 3(4) =12

(4,12)

x=-1

y =3x = 3(-1) =-3

(-1,-3)

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Answer:

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