Question

Which equation can be solved by using this system of equations?

[y= 3x2 - 7x2 + 5
Ly = 7x4 + 2x

Answer 1

Answer is B. 3x^3-7x^2+5 = 7x^4+2x

Step-by-step explanation:

got it right!

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Answer 2

Question:

Which equation can be solved by using this system of equations?

y = 3x^3 - 7x^2 + 5

y = 7x^4 + 2x

A.) 3x^3 - 7x^2 +5 = 0

B.) 3x^3 - 7x^2 + 5 = 7x^4 +2x

C.) 7x^4 +2x = 0

D.) 7x^4 +3x^3 -7x^2 +2x + 5 = 0

Answer:

Option B:
`3x^(3) -7x^(2) +5=7x^(4) +2x` is used to solve this system of equations.

Step-by-step explanation:

The two equations are
`y=$3 x^(3)-7 x^(2)+5$` and
`y=$7 x^(4)+2 x$`

Using substitution method, let us substitute
`y=$7 x^(4)+2 x$` in the equation
`y=$3 x^(3)-7 x^(2)+5$`, we get,

`3x^(3) -7x^(2) +5=7x^(4) +2x`

Thus,
`3x^(3) -7x^(2) +5=7x^(4) +2x` is used to solve this system of equations.

Hence, Option B is the correct answer.