Determine the value of the variable \( y \). \[ \left\{\begin{array}{c}x+y+z=1 \\ -2 x-y-z=3 \\ x+y+3 z=-1\end{array}\right. \]

\( 22 \quad \frac { 1 } { 4 } x - \frac { 5 } { 2 } = - 2 \)

18. \( \begin{aligned} y & =x-5 \\ y & =-2 x-5\end{aligned} \)

D) A student claimed that the largest integer of \( k \) for which the graph \( y=2 x^{2}-3 x+k-1 \) meets the \( x \)-axis is 2 . Verify this statement.

Add the polynomials: (x^4 + 3x^3 - x) + (2x^4 - 5x^3 + 4).

3.1.2 The number pattern is quadratic and \( T_{4}=2+5 y \). 3.2 In a linear number pattern, the \( 19^{\text {th }} \) term is 40 and the \( 7^{\text {th }} \) term is 16 . Thus, determine the first two terms.