Question

If x -12y = -210 and x -6y =90, then x=

Answer 1

x-6y=90, x = 90+6y

x-12y = -210

90+6y-12y= -210

-6y = -210-90

y = 300/6

y=50

x-6(50) = 90

x = 90+300

x = 390

Answer 2

Answer:

x = 390.

Step-by-step explanation:

Given : x - 12y = -210 and x -6y =90 .

To find : Find x .

Solution : We have given

x - 12y = -210 ----------(1)

x -6y =90  ----------(2)

Subtracting equation 2 from equation 1.

x - 12y = -210

(-)x -(+)6y = (-)90

____________

0 - 6y = -300

On dividing both sides by - 6y.

y = 50.

Plug the value of y = 50 in equation 1.

x - 12 ( 50 ) = -210.

x - 600 = -210

On adding both sides by 600

x = -210 +600.

x = 390.

Therefore, x = 390.