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alex41 [277]
3 years ago
8

I need some help on number 15 please...

Mathematics
1 answer:
kondaur [170]3 years ago
3 0
To solve this problem, all you need to do is make a standard graphing equation. The first step is finding mode using two points from the table. We'll use (1, 70) and (2, 90).
\frac{y_{1}- y_{2}  }{ x_{1}- x_{2}}  \\  \frac{70-90}{1-2}  \\  \frac{-20}{-1}  \\ 20
From the work, we've found that the slope of this equation is 20.

Next, we need to finish writing the equation and plug in the coordinates to solve for the y-intercept.
y=20x+b \\ 90=20(2)+b \\ 90=40+b  \\ (90)-40=(40+b)-40 \\ b=90-40  \\ b=50

Now we have all the information we need to write our equation, which is:
y = 20x+50

Hope this helps!

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