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- MHB
- Thread starter Sarahq
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MHB

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For your Problem 5, you should notice that as $X$ increases by $1$, $Y$

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The formula for linear equations is

\[ y = mx+b \]

m = slope and b = shift on the y-axis.

The following formula is used to calculate the slope m

\[ m = \frac{y_2-y_1}{x_2-x_1} \]

(here -2/1 = -2)

Use x-, y-values and m to calculate b:

\[ -23 = -2 * 13 + b \]

solve for b:

\[ -23 = -26 + b | +26 \]

\[ 3 = b \]

so:

\[ y = -2x + 3 \]

Now just set y = 31 and solve for x.

Hope it was helpfull :)

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