x+3y=1 -3x-3y=-15. How do i solve this?

Answer 1

x + 3y =1

x = 1 -3y ---->(equation 1)

-3x - 3y = -15

=> -x - y = -5

=> x = 5-y ---->(equation 2)

So, we can say x = x and use the values from both equations.

1 - 3y = 5 - y

=>-3y + y = 5-1

=>-2y = 4

y = -2

Now, we can put the value of y = -2 into any equation, leys use equation 2 and find x

x = 5 - y

x = 5 - (-2)

x = 7

Answer 2

x + 3y = 1

3x+3y=15 (Notice: this equation has been multiplied by -1.)

Subtract the first equation from the 2nd: 2x = 14

x=7

Plug the value of x into either equation to get y.