Find the slope of the line through each pair of points. Slope \( =\frac{y_{2}-y_{1}}{x_{2}-x_{1}} \) \( \begin{array}{lll}\text { a. }(8,-7) \text { and }(5,-3) & \text { b. }(-5,9) \text { and }(5,11) & \text { c. }(-8,-4) \text { and }(-4,-9)\end{array} \)

a) Zeichne den Graphen folgender Funktionen in ein gemeinsemes Koordinatensysiem: (1) \( y=2 x+1 \) (2) \( -2 x-1 \) (3) \( y=2 x-1 \) b) Gib die Schnitpunkte der drei Geraden an.

Find the slope of the line passing through the given points. (If an answer is undefined, enter UNDEFINED.) \[ (7,-4) \text { and }(7,-3) \]

\( 1^{\circ} \) a) Write \( \widehat{x O z} \) using \( \widehat{x O y} \) and b) Write \( \widehat{y O I} \) using \( \widehat{y O z} \) and c) Show that \( \widehat{x O z}=\widehat{y O t} \).

b. La figura se armó con cubos cuyas aristas miden \( 3,5 \mathrm{~cm} \). Respuesta: ¿Cuál es el el volumen de la figura compuesta? de uno de los cubos?

Find the equation of the line passing through \( (4,-3) \) which is perpendicular to the \( x \)-axis.