Question

Solve systems of equations for x + y, please!!

6x + 2y = 30
9x - 4y = 3

Answer 1

Answer is x+y=3+6=9

Thank me later lol

Answer 2

9

Explanation:

6x + 2y = 30

9x - 4y = 3

if we double the first equation and add up to second one, we cancel 4y:

• 12x+9x=60+3 ⇒ 21x=63 ⇒ x=3

now we can find y:

• 6*3+2y=30 ⇒ 2y= 30- 18 ⇒ 2y= 12 ⇒ y=6

finally, x+y

• x+y= 3+6= 9