Question

Решите пожалуйста. ​

Answer 1

$\left \{ {{y=5x+7} \atop {4x-y=-9}} \right.$                              

$\left \{ {{y=5x+7} \atop {4x-(5x+7)=-9}} \right.$                      

$\left \{ {{y=5x+7} \atop {4x-5x-7=-9}} \right.$

$\left \{ {{y=5x+7} \atop {-x-7+9=0}} \right.$

$\left \{ {{y=5x+7} \atop {-x+2=0}} \right.$    

$\left \{ {{y=5x+7} \atop {x=2}} \right.$

$\left \{ {{y=5*2+7} \atop {x=2}} \right.$$\left \{ {{y=17} \atop {x=2}} \right.$