Question

What is the result of substituting for y in the bottom equation?

y = x + 3

y= x2 + 2x-4

A. x+ 3 = x2 + 2x - 4

B. X+ 3 = x2

C. y= (x+3)2 + 2(x + 3) - 4

D. y= x2 + 2x - 4 - (x+3)

Answer 1

(A)
`x + 3= x^2 + 2x-4`

Explanation:

Given the equations:

`y = x + 3\\y= x^2 + 2x-4`

Substitution simply means replacing the variable y in the second equation with its equivalent x+3 from the first equation.

Substitution of y into
`y=x^2 + 2x-4` gives us:

`x + 3= x^2 + 2x-4`

The correct option is A.