Answer:
first option
Step-by-step explanation:
The equation representing a proportional relationship is
y = kx ← k is the constant of proportion
Here k = 0.7, thus
y = 0.7x ← is the required equation
Given
= 
( cross- multiply )
10y = 7x ( divide both sides by 10 )
y = x = 0.7 x ← the required equation
1. Do inverse operation
-128 = 8x
8 8
-16 = x
2. Substitute (Optional)
-128 = 8(-16)
-128 = -128
Answer:
It would\ be -7 F.
Step-by-step explanation:
Answer:
i think it is f(x)= 10m+0.10s
x= number text messages send
m= months
for example: if you send 200 messages and were in the plan for 3 month the function will go like this;
f(x)= 10(3)+0.10(200)
=30+20
= $50
