1-3x-y=3 2x+y=25 Let’s start with the first one. Subtract 1 from each side -3x-y=2 Then add -3x to each side -y=3x+2 Then move the negative and change the signs Y=-3x-2 Now plug into the second equation 2x+(-3x-2)= 25 Now solve for x 2x-3x-2=25 Add 2 to both sides 2x-3x=27 Now subtract -x=27 Move the negative to the other side because x can not be negative X=-27 Now plug that into the second equation 2(-27)+y=25 Now just solve -54+y=25 Y=79
