Question

Помогите пожалуйста!!! Даю 50 баллов​

Answer 1

$\displaystyle\bf y = kx + b \\ \\ \left \{ {{k + b = 4 \: \: | \times 2} \atop { - 2k + b = 13 }} \right. \\ \displaystyle\bf\\ + \left \{ {{2k + 2b = 8} \atop { - 2k + b = 13 }} \right. \\ \\ 2b + b = 8 + 13 \\ 3b = 21 \\ b = 21 \div 3 \\ b = 7 \\ \\ k + 7 = 4 \\ k = 4 - 7 \\ k = - 3$

Ответ: у = - 3х + 7