8x+2y=22
y=11-4x
5x-3(11-4x)=1
5x-33+12x=1
17x=34
x=2
y=11-4*2=3
ответ: B (2;3)
<span>1)</span>
<span>х^2-7x+a=0</span>
<span><span>2^2-7*2+a=0</span></span>
<span><span>a=10</span></span>
<span><span>2)</span></span>
<span><span><span>х^2-7x+10=0</span></span></span>
<span><span><span>D=b^2-4ac=49-4*10=9</span></span></span>
<span><span><span>x=2</span></span></span>
<span><span><span>x=5</span></span></span>
Ответ: x=5 ;a=10
X=6
ну вот так вот наверное)