gonzalesalexiaouv1bg
03.08.2019 •
Mathematics
Answer these 2 questions i really really need it im being 2. which ordered pair is the solution to the system of equations? x - 4y = 6 3x + y = -8 a. (1, −9) b. (−2, −2) c. (2, −1) d. (−6, −3) 3. which ordered pair is the solution to the system of equations? -3x + 4y = -20 x + 4 = -4 a. (−4, −8) b. (4, −2) c. (8, 1) d.(−12, 2)
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Ответ:
x - 4y = 6
3x + y = -8 so y = -3x - 8
substitute y = -3x - 8 into x - 4y = 6
x - 4y = 6
x - 4(-3x - 8) = 6
x + 12x + 32 = 6
13x = -26
x = -2
y = -3x - 8
y = -3(-2) - 8
y = 6 - 8
y = -2
answer
B. (−2, −2)
3. Which ordered pair is the solution to the system of equations?
-3x + 4y = -20
x + 4y= -4
subtract
-4x = -16
x = 4
x + 4y= -4
4 + 4y= -4
-4y = -8
y = -2
answer
B. (4, −2)
The second question you wrote -3x + 4y = -20 x + 4 = -4
second equation was missing y so i assumed it's x + 4y= -4If so then use my answer for second one, If not, don't use it.
Ответ: