Помогите пожалуйста дам 30 баллов

Question 1

Question 2

Відповідь:

Покрокове пояснення:

1 a)

$\left \{ {{y-2x=4} \atop {7x-y=1}} \right.$ $\left \{ {{y=4+2x} \atop {7x-y=1} \right.$ $\left \{ {{y=4+2x} \atop {7x-(4+2x)=1} \right.$ $\left \{ {{y=4+2x} \atop {7x-4-8x=1} \right.$ $\left \{ {{y=4+2x} \atop {7x-8x=1+4} \right.$ $\left \{ {{y=4+2x} \atop {-x=5} \right.$

$\left \{ {{y=4+2x} \atop {x=-5} \right.$ $\left \{ {{y=4+2*(-5)} \atop {x=-5} \right.$ $\left \{ {{y=4-10} \atop {x=-5} \right.$ $\left \{ {{y=-6} \atop {x=-5} \right.$

б)

$\left \{ {{2x+y=2} \atop {6x-2y=4}} \right.$ $\left \{ {{y=2-2x} \atop {6x-2y=4}} \right.$ $\left \{ {{y=2-2x} \atop {6x-2(2-2x)=4}} \right.$ $\left \{ {{y=2-2x} \atop {6x-4+4x=4}} \right.$ $\left \{ {{y=2-2x} \atop {6x+4x=4+4}} \right.$

$\left \{ {{y=2-2x} \atop {10x=8}} \right.$ $\left \{ {{y=2-2x} \atop {x=8:10}} \right.$ $\left \{ {{y=2-2x} \atop {x=0.8}} \right.$ $\left \{ {{y=2-2*0.8} \atop {x=0.8}} \right.$ $\left \{ {{y=2-1.6} \atop {x=0.8}} \right.$ $\left \{ {{y=0.4} \atop {x=0.8}} \right.$

2

$\left \{ {{2x-y=2} \atop {3x-2y=3}} \right.$ $\left \{ {{y=2x-2} \atop {3x-2y=3}} \right.$ $\left \{ {{y=2x-2} \atop {3x-2(2x-2)=3}} \right.$ $\left \{ {{y=2x-2} \atop {3x-4x+4=3}} \right.$ $\left \{ {{y=2x-2} \atop {3x-4x=3-4}} \right.$

$\left \{ {{y=2x-2} \atop {-x=-1}} \right.$ $\left \{ {{y=2x-2} \atop {x=1}} \right.$ $\left \{ {{y=2*1-2} \atop {x=1}} \right.$ $\left \{ {{y=2-2} \atop {x=1}} \right.$ $\left \{ {{y=0} \atop {x=1}} \right.$