Question

todo con explicacion

Answer 1

• 2x+y=9

2x=9-y

x=(9-y)/2

• x-y=12

$\frac{9 - y}{2} - y = 12$

$\frac{9 - y}{2} \times 2 - y \times 2 = 12 \times 2$

$9 - y - 2y = 24$

9-3y=24

-24+9=3y

-15=3y

-5=y

• 2x+y=9
• 2x+(-5)=9
• 2×-5=9
• 2×=9+5
• 2×=14
• ×=7