Answer:
y = 
x
Step-by-step explanation:
given y varies directly as x, the the equation relating them is
y = kx ← k is the constant of variation
to find k use the given condition y = 10 when x = 6, hence
k = 
= 
=
y = x ← is the equation
Answer:
-50
Step-by-step explanation:
-71 + 21
-50
The 21 is positive so we subtract it off like when we do 1 - 1. The second 1 is negative to the first 1 who is positive.
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Answer:
17.5, divide 70 by 4
Step-by-step explanation:
what i said above
Answer:
Use multiplication (V = l x w x h) to find the volume of a solid figure.
Step-by-step explanation:
Use substitution.
y = 2 - x and y = 4x + 7 can become
2 - x = 4x + 7
Now solve for x
-5 = 5x
-1 = x
Now plug -1 for x in either equation.
y = 2 - x -> y = 2 - (-1) -> y = 3
y = 4x + 7 -> y = 4*-1 + 7 -> y = -4 + 7 -> y = 3
So C) is the correct answer.
