Question

решите примеры с доски, даю 20 баллов​

Answer 1

Ответ:

1)

$y = 2x - 0,5\\x = -3\\y = 2 * -3 - 0,5 = -6 - 0,5 = -6,5\\x = -2\\y = 2* -2 -0,5 = -4 - 0,5 = -4,5\\x=-1\\y=2*-1-0,5=-2-0,5=-2,5\\x=0\\y=2*0-0,5=-0,5\\x=1\\y=2*1-0,5=1,5\\x=2\\y=2*2-0,5=3,5\\x=3\\y=2*3-0,5=5,5\\x=4\\y=2*4-0,5=7,5.$

2а)

$y=2-6x\\y=-8\\-8=2-6x\\6x=2+8\\6x=10\\x=10/6\\x=1\frac{4}{6}\\x=1\frac{2}{3}.\\\\y=2-6x\\y=9\\9=2-6x\\6x=2-9\\6x=-7\\x=-7/6\\x=-1\frac{1}{6}.$

2б)

$y=\frac{1}{4}x-6\\y=0,2\\0,2=\frac{1}{4}x-6\\\frac{1}{4}x=0,2+6\\\frac{1}{4}x=6,2\\x=6,2*4\\x=24,8.\\\\y=\frac{1}{4}x-6\\y=-\frac{2}{3}\\-\frac{2}{3}=\frac{1}{4}x-6\\\frac{1}{4}x=-\frac{2}{3}+6\\x = 4* (6-\frac{2}{3})\\x =24-\frac{8}{3}\\x=22-\frac{2}{3}\\x=21\frac{1}{3}.$