Exercice 2 Soit \( f \) la fonction polynôme de degr 1. Quel est l'ensemble de définitio 2. Déterminer graphiquement \( f(0) \) 3. Montrer que l'expression littéral 4. Dresser le tableau de variations 5. Cr admet-elle un extremum? Si

\( 1 \leftarrow \quad \begin{array}{l}\text { Determine whether the ordered pair }(3,4) \text { is a solution of the system. } \\ \begin{array}{l}x+y=7 \\ x-y=-1\end{array}\end{array} \)

The cost price of a pen is Rs \( (3 x+5) \) and is selling price is \( \operatorname{Rs}(4 x+3) \) Write the formulato find protit.

\( 1<\quad \begin{array}{r}\text { Determine whether the ordered pair }(4,5) \text { is a solution of the system. } \\ \begin{array}{r}3 x+2 y=2 \\ 2 x+y=3\end{array}\end{array} \)

\( 1 \leftarrow \quad \begin{array}{r}\text { Solve the system of equations by the substitution method. } \\ \begin{aligned} x+y & =-2 \\ y & =-2 x\end{aligned}\end{array} \)

\( 1 \leftarrow \begin{array}{l}\text { Determine whether the ordered pair }(2,6) \text { is a solution of the system. } \\ \begin{array}{l}x+y=8 \\ x-y\end{array}\end{array} \)