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3 years ago

Can someone please help me ASAP

Mathematics

1 answer:

charle [14.2K]3 years ago

4 0

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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3 years ago

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Z varies directly as x and y, z = 6 when x=2 and y = 6. Find the value of z when x = 3 and y = 8

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Answer:

Step-by-step explanation:

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Answer:

a) 3/5 < 4/5

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Step-by-step explanation:

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Flip the sign and the placement of the fraction so 3/5 is less then 4/5.

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c) We need to change the denominators to a common denominator to compare the size of the two fractions:

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