Use subtitution method to solve the problem.
First, change y to the value of x in order to find the exact value of x.
x + y = 4
y = 4 - x
Second, subtitute y with 4 - x from the first equation
y = -x² + 2x + 4
4 - x = -x² + 2x + 4
move all terms to the left side
x² - 2x - x + 4 - 4 = 0
x² - 3x = 0
x(x - 3) = 0
x = 0 or x = 3
Third, now we have 2 values of x. Find the value of y for each of x
For x = 0
y = 4 - x
y = 4 - 0
y = 4
For x = 3
y = 4 - x
y = 4 - 3
y = 1
The solution is (0,4) and (3,1). The answer is option b
Answer:
= 9x^15/7
Step-by-step explanation:
Answer:
The answer is D for this question. The one at the very bottom of the picture. The other person who answered on this question is incorrect.
Step-by-step explanation:
Answer:
(2 decimal places)
Step-by-step explanation:
Quadratic Formula: 
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Plug in values:
First value of x:
(2 decimal places)
Second value of x:
(2 decimal places)
