Answer:
The solution is x = -2, y = -3
Step-by-step explanation:
Let's start with the equation 3x + y = -9
Substitute the y for 5x+7 seen in the second equation
Now you have 3x + (5x+7) = -9
Lets solve:
Let's add the x's
Now we have 8x + 7 = -9
Substracy seven from each side
Now we have 8x = -16
Now let's divide 8 on each side
Now we have x = -2
Now lets plug in -2 to the second equation
The second equation is y = 5x+7
When we plug in -2 we get y=5(-2)+7
We multiply
We now have y = -10+7
Add
y = -3
The solution is x = -2, y = -3
(B)
Explanation:
4 quarts are in a gallon so one gallon equals 4(1). The one represents the amount of gallons so if there are x gallons it would become 4(x)
Answer:
Option D, 5 plus i square root of 11
Step-by-step explanation:
We have to find the solution of x² - 10x = -36
x² - 10x = -36
x² - 10x + 36 = 0
x² - 2(5x) + 25 + 11 = 0
(x-5)² + 11 = 0
(x-5)² = -11
(x-5) = √(-11)
x = 5 + i√11 [ since √(-1) = i]
Option D 5 plus i square root of 11 is the answer.
Answer:
You divide 30 by 10 first.
Step-by-step explanation:
That is the answer because according to the Order of Operations you have to multiply multiplication and division by left is first to right.
