If y= 4x-2, what is y when x is 4?
Evaluating Equations for Specified Values of a Variable:
In mathematics, an equation in two variables is exactly as its name implies; an equation with two variables. When given an equation in two variables, we can find the value of one of the variables, y, for a specified value of the other variable, x, by plugging in the given value of x for x in the equation, and then solving for y.
Answer and Explanation:
If, y = 4x - 2, then when x = 4, y = 14. To find the value of y when x = 4, we plug 4 in for x into the equation, and then solve for y. This goes as follows:
- y = 4x - 2
Plug in x = 4.
- y = 4(4) - 2
Simplify the right-hand side of the equation.
- y = 16 - 2
- y = 14
We get that when x = 4, y = 14.
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Learn more about this topic:
from ELM: CSU Math Study GuideChapter 6 / Lesson 3