Question

3x+9y=9 4x-9y=12 Solving systems by elimination

Answer 1

Answer:

(x,y)=(3,0)

Step-by-step explanation:

$\left \{ {{3x+9y=9} \atop {4x-9y=12}} \right.$

⇒ 7x=21 divide both sides of the equation by 7

⇒ x=3

then put x=3 in the equation 3x+9y=9

⇒ 3×3+9y=9

⇒ 9+9y=9

⇒ 9y=9-9

⇒ 9y=0 divide both sides of the equation by 9

⇒ y=0

(x,y)=(3,0)

⇒ $\left \{ {{3*3+9*0=9} \atop {4*3-9*0=12}} \right.$

⇒ $\left \{ {{9=9} \atop {12=12}} \right.$

⇒ (x,y)=(3,0)

Answer 2

X=3 y=0

hope this helps!