Which represents the solution(s) of the system of equations [tex]$y + 4 = x^2$[/tex] and [tex]$y - x = 2$[/tex]? Determine the solution set by graphing.

A. [tex]$(-2,0)$[/tex]
B. [tex]$(-2,0)$[/tex] and [tex]$(2,0)$[/tex]
C. [tex]$(-2,0)$[/tex] and [tex]$(3,5)$[/tex]
D. no solutions



Answer :

To determine the solution set for the given system of equations, let's solve them step by step. The equations are:

1. [tex]\( y + 4 = x^2 \)[/tex]
2. [tex]\( y - x = 2 \)[/tex]

We start with the second equation:
[tex]\[ y - x = 2 \][/tex]
We can solve this for [tex]\( y \)[/tex]:
[tex]\[ y = x + 2 \][/tex]

Now, we substitute [tex]\( y = x + 2 \)[/tex] into the first equation [tex]\( y + 4 = x^2 \)[/tex]:
[tex]\[ (x + 2) + 4 = x^2 \][/tex]
[tex]\[ x + 6 = x^2 \][/tex]

Rearrange this to form a standard quadratic equation:
[tex]\[ x^2 - x - 6 = 0 \][/tex]

Next, we solve this quadratic equation by factoring:
[tex]\[ x^2 - x - 6 = 0 \][/tex]
[tex]\[ (x - 3)(x + 2) = 0 \][/tex]

Setting each factor to zero gives:
[tex]\[ x - 3 = 0 \quad \text{or} \quad x + 2 = 0 \][/tex]
So, we find [tex]\( x = 3 \)[/tex] and [tex]\( x = -2 \)[/tex].

Now, we can find the corresponding [tex]\( y \)[/tex] values for each [tex]\( x \)[/tex]:

1. For [tex]\( x = 3 \)[/tex]:
[tex]\[ y = x + 2 \][/tex]
[tex]\[ y = 3 + 2 \][/tex]
[tex]\[ y = 5 \][/tex]
Thus, one solution is [tex]\((3, 5)\)[/tex].

2. For [tex]\( x = -2 \)[/tex]:
[tex]\[ y = x + 2 \][/tex]
[tex]\[ y = -2 + 2 \][/tex]
[tex]\[ y = 0 \][/tex]
So, the other solution is [tex]\((-2, 0)\)[/tex].

Therefore, the solutions to the system of equations are:
[tex]\[ (-2, 0) \quad \text{and} \quad (3, 5) \][/tex]

So, the correct answer is:
[tex]\[ (-2, 0) \text{ and } (3, 5) \][/tex]