Question

Помогите плиз с алгеброй

Answer 1

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Answer 2

$\left \{ {{x=y-7;} \atop {x^2+4y-49=0}} \right. \Leftrightarrow (y-7)^2+4y-49=0; \Leftrightarrow y^2-14y+49+4y-49=0; \Leftrightarrow y^2-10y=0;$

y(y-10)=0;

y1=0; x1=-7;

y2=10; x2=3;

(-7;0), (3;10);

0,75*0,89-1,56=0,89*3/4-1,56=0,6675-1,56=-0,8925;