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3 years ago

Which equation can be used to solve the problem? 60 percent of what number is 30?

Mathematics

1 answer:

Agata [3.3K]3 years ago

8 0

Answer:

Step-by-step explanation:

Let the unknown number be n. Then 0.60n = 30, and n = 30/0.60 = 50.

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ANSWER:

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STEP-BY-STEP EXPLANATION:

We have that the equation in its slope-intercept form is the following:

$\begin{gathered} y=mx+b \\ m\text{ is the slope and b is the y-intercept } \end{gathered}$

The slope can be calculated as follows:

$m=\frac{y_2-y_1}{x_2-x_1}$

We use the points (4,7) and (1,1) to calculate the slope:

$m=\frac{1-7}{1-4}=\frac{-6}{-3}=2$

Now, we calculate the value of b, using the point (1,1) and the slope, like this:

$\begin{gathered} 1=1\cdot2+b \\ b=-2+1 \\ b=-1 \end{gathered}$

Therefore, the equation would be:

$y=2x-1$

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