emilyplays474
24.07.2019 •
Mathematics
Lesson 3 unit 7, solving systems using elimination quiz 1. (i've already answered this) 2. what is the solution of the system? 7x + 5y = 19 -7x - 2y = -16 (a). (2, 1) (b). (1, 2) (c). (7, 5) (d). (-7, -2) 3. which method would be the simplest way to slove the system? y = 1/2x 2x + 3y = 28 (a). graphing (b). substitution (c). elimination (d). distributive 4. what is the solution of the system? y = -3x 3x + 2y = 6 (a). (2, 6) (b). (-1, 3) (c). (-2, 6) (d). (1.5, -4.5) 5. how many solutions does this system have? -3x + 6y = 10 -3x + 6y = -4 (a). none (b). one (c). infinite (d). two 6. in wich quadrant does the solution of the system fall? y = x - 1 y = -3x - 5 (a). i (b). ii (c). iii (d). iv
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Ответ:
2) A
3) B
4) C
5) A
6) C
Step-by-step explanation:
2) Lets add 2 equation together, we will find:
If we put y value in the first equation:
It is A
3) Substation is the best way to solve the system.
Lets multiply first equation with 4:
Substitute 2x with 4y:
and x=8
4) Again lets substitute 3x with -y:
Therefore x=-2
Correct answer is C
5) None of real numbers is the solution of this system.
6) First lets multiply first equation with -1 and add equations together:
It falls to III
The answer is C
Ответ:
x = 7, y = 2
Step-by-step explanation:
I assume it is 3/(x-7) + 2.
When x = 7, there is an asymptote because it is undefined.
When y = 2, there is also one, because 3/(x-7) is never 0.
These are the only ones.