{x-6y=17 {6x=30 {х=5 {х=5 {х=5
{5x+6y=13, {х-6у=17, {5-6у=17, {-6y=12, {у=-2
<span>1. {x=17+6y <span>{5(17+6y)+6y=13</span></span>
<span><span>2. <span>{x=17+6y <span>{85+30y+6y=13</span></span></span></span>
<span><span><span><span>3. <span>{x=17+6y <span>{36y=-72</span></span></span></span></span></span>
<span><span><span><span><span><span>4. <span>{x=5 <span>{y=-2</span></span></span></span></span></span></span></span>
x^2+4x-12 больше или равно 0
x^2+4x-12=0
D=64
x1=-6
x2=2