Question

40 БАЛЛОВ ДАЮ СРОЧНООО

Answer 1

$\displaystyle\bf\\\left \{ {{a-7t=5} \ |\cdot(-7)\atop {7a+2t=36}} \right. \\\\\\+\left \{ {{-7a+49t-35} \atop {7a+2t=36}} \right. \\----------\\51t=1\\\\\\t=\frac{1}{51} \\\\\\a=5+7t=5+7\cdot\frac{1}{51} =5+\frac{7}{51} =5\frac{7}{51} \\\\\\Otvet:\\\\\\\boxed{a=5\frac{7}{51} }\\\\\\\boxed{t=\frac{1}{51}}$