12.
y = kx
8 = -4k
so k = -2
y = -2x
y = -2 (7)
y = -14
13.
y = kx
15 = 6k
so k = 15/6 = 2.5
y = 2.5x
y = 2.5 (7)
y =17.5
14.
y = kx
3 = 9k
so k = 3/9 = 1/3
y = 1/3x
y = 1/3 (7)
y =7/3
15
y = kx
-4 = 4k
so k = -4/4 = -1
y = - x
y = - (7)
y = -7
16.
Yes. y varies directly with x
slope = (3+6)/(2+1) = 9/3 = 3
y = mx + b
-6= 3(-1) + b
b = -6 + 3 = -3
equation y = 3x -3
17.
Yes
slope = (2.5 - 7.5)/(-1+3) = -5/2 = -2.5
y = mx + b
7.5= -2.5(-3) + b
7.5 = 7.5 + b
so b = 0
equation
y = -2.5x
Answer:
18.84 units
Step-by-step explanation:
the formula for the circumference is 2× pi × radius.
the radius is half the diameter, so the formula would be 2×pi×6/2
the answer to 2 decimal places is therefore 18.84 units
You plug in the numbers listed under x into the equation, and it will give you your y value:
x is 3
y = 4(3)
y = 12
x is 4
y = 4(4)
y = 16
x is 5
y = 4(5)
y = 20
Answer:
i dont know that answer
Step-by-step explanation:
