Option 1. The equation that represents the direct variation that exists between a and b is b = –a.
<h3>How to find the direct variation here</h3>
The direct variation is of this form y ∝ x
This gives the equation
y = kx
The constant is k
From our question we have
b ∝ a so b = ka
b = 
a = 
Remember that b = ka

This would cancel out to
1 = -k
or k = -1
Hence the equation would be written as
b = -a
Read more on direct variation here:
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To the nearest whole percent the margin error for this poll would be <span>38% ⁺/₋ 14%. If you want me to explain feel free to ask! </span>
Answer: 11.7
Step-by-step explanation: 90*0.13=11.7
Multiply the main number by the percentage, to find the answer.
1% is 0.01
10% is 0.1
Answer:
42
Step-by-step explanation: