Question

помогите пж срочно!!!​

Answer 1

$\displaystyle\bf\\\left \{ {{ax - 12y = - 8} \atop {5x - 3y = - 2 \: \: | \times 4 }} \right. \\ \displaystyle\bf\\\left \{ {{ax - 12y = - 8} \atop {20x - 12y = - 8 }} \right. \\ \\ a = 20$