Question

Solve the system of equations by the addition method.

Answer 1

$\left \{ {{\frac{x}{2}-y=7 } \atop {-\frac{x}{7}+\frac{2y}{7}= -2 }} \right. <=>\left \{ {{\frac{x}{2}.2-2y=2.7} \atop {-\frac{x}{7}.7+\frac{2y}{7}.7= -2.7}} \right. <=>\left \{ {{x-2y=14} \atop {-x+2y=-14}} \right. <=>\left \{ {{0x=0} \atop {y={\frac{x}{2}-7}} \right.$

ANSWER: B

ok done. Thank to me :>

Answer 2

Integer solution

x= 2n, y=n-7, nEZ

real solution    or you can use inverse operation to have addition

y= x/2-7               y=x[multiplied by] 2+7

oh and for the first one the choice is A the second one im sorry im not sure