Respuesta :
You can replace the symbol x with the given value in the given equation and then calculate the value of y. Know that coefficients are in multiplication with the variables.
The value of y in the given equation when x = 0.3 is given by
Option C: 9.25
How to put values in a given expression of variables?
If you have got a variable's value in the given expression, you can replace that variable with the value that you got.
Suppose that the given expression is [tex]3x + 4[/tex] and you know that x = 5, then you can put that value in place of x as:
[tex]3x + 4|_{x=5} \: \: = \: \:3 \times (5) + 4 = 15 + 4 = 20[/tex]
It is because [tex]3x[/tex] means [tex]3 \times x[/tex] and is written in short as [tex]3x[/tex]
Using the above conclusion for evaluating y
Putting the value x = 0.3 in the given equation, we get;
[tex]5x + 2y = 20\\5 \times 0.3 + 2y = 20\\1.5 + 2y = 20\\\\\text{Subtracting 1.5 from both sides}\\\\1.5 - 1.5 + 2y = 20 - 1.5\\2y = 18.5\\\\\text{Dividing both sides by 2}\\\\\dfrac{2y}{2} = \dfrac{18.5}{2}\\\\\dfrac{2 \times y}{2} = y = 9.25[/tex]
Thus,
The value of y in the given equation when x = 0.3 is given by
Option C: 9.25
Learn more about system of linear equations here:
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