1/2 because there is 7 girls and 7 boys in total
Choice a.....................
Answer:
8y=8 or 4y=-4
Step-by-step explanation:
1.)-2(x+3y=-1)
2x+2y=6
2.)-2x+6y=2
2x+2y=6
3.)6y=2
2y+6
4.)8y=8 (If adding) or 4y=-4 (If subtracting)
Answer:
A: up 3 units
Step-by-step explanation:
Hopefully this helps!
6.
4x^2 + 4 = 0
Divide both sides by 4
x^2 + 1 = 0
Use the quadratic formula since this cannot be factored.
x = (-b +- sqrt(b^2 - 4ac))/(2a)
x = +- sqrt(-4(1)(1))/2
x = +- sqrt(-4)/2
x = +- 2i/2
x = +- i
x = i or x = -i
Quicker solution:
If you have x^2 = number, then
x = +- sqrt(number)
Once you get to
x^2 + 1 = 0
Subtract 1 from both sides
x^2 = -1
Apply the quick method
x = +- sqrt(-1)
x = +- i
8.
2x^2 + 50 = 0
Divide both sides by 2
x^2 + 25 = 0
Subtract 25 from both sides
x^2 = -25
Apply quick method
x = +- sqrt(25)
x = +- 5i
x = 5i or x = -5i
