Tomas = t
Grandfather = 10t
10t=100
<u>10t</u> = <u>100
</u>10 10
<u>
</u>t=10
<u>
</u>Tomas is 10 years old.<u>
</u>
The linear equation of the tangent at point A is given by:

<h3>What is a linear function?</h3>
A linear function is modeled by:
y = mx + b
In which:
- m is the slope, which is the rate of change, that is, by how much y changes when x changes by 1.
- b is the y-intercept, which is the value of y when x = 0, and can also be interpreted as the initial value of the function.
In this problem, to find the slope, we need to find the derivative at (4,3), using implicit differentiation. Hence:



Then:

We use point (4,3) to find b, hence:



Hence, the equation is:

More can be learned about linear equations at brainly.com/question/24808124
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We are given equation 2x+3y=9xy.
A linear equation is a equation that has maximum degree of the equation as 1.
Degree is the maximum power(exponent) of the variables.
If two variables are being multiplied together in a term, we can find power of the that term by adding powers of those variables.
In the given equation, on the left side we have two terms 2x and 3y, each opf the variable x, and y has power 1 and right side of the eqaution we have term 9xy. There x and y variables are being multiplied together.
So, the total power of the term would be 1+1=2.
So, the degree of the given equation would be 2.
Because degree of the given equation is not 1. Therefore, given equation is not a linear eqaution and it is a non-linear equation.
The answer is AB should be 2 feet not 3. :) Hopes this helps, have a good day.