Answer:
x^2 -2x = 4x+1
2x^2 +12x = 0
9x^2 +6x -3=0
Step-by-step explanation:
A quadratic equation has the highest power of x being squared
x^2 -2x = 4x+1
2x^2 +12x = 0
9x^2 +6x -3=0
These are all quadratic equations
Answer:
use -9 to multiply the first equation
use -4 to multiply the second equation.
Step-by-step explanation:
5x-4y=28.....eqn (1)×-9
3x-9y=30....eqn(2)×-4
-45x+36y=-252
-(-12x+36y=-120)
therefore, -33x÷33 =-132÷-33
x=4.
substitute (x=4) in any of the equation. I'm just going to use eqn 1.
5x-4y=28
5(4)-4y=28
20-4y=28
-4y =28-20
-4y÷-4 = 8÷-4
y=-2
so, x=4, y=-2
Note: for proof of answers substitute the answers for x and y and see if you have the same result...e.g
5(4)-4(-2)=28.
Answer:
Step-by-step explanation:
The third option would be the incorrect one
Answer: See explanation
Step-by-step explanation:
Your question isn't complete but I'm assuming that you want to calculate the radius.
Circumference of a circle = 2πr
where Circumference = 18.9 meters
Radius = Unknown
π = 3.14
We then put the values into the formula which will be:
C = 2πr
18.9 = 2 × 3.14 × r
18.9 = 6.28r
r = 18.9 / 6.28
r = 3
The radius = 3 meters
Assuming you probably want to get the diameter, we multiply the radius by 2. This will be:
= 2 × 3
= 6 meters
