How do you solve x + y = 12 and y = 2x?

Related questions

• How do you solve systems of equations using the substitution method?
• How do you check your solutions to a systems of equations using the substitution method?
• When is the substitution method easier to use?
• How do you know if a solution is "no solution" or "infinite" when using the substitution method?
• How do you solve #y=-6x-3# and #y=3# using the substitution method?
• How do you solve #12y-3x=-1# and #x-4y=1# using the substitution method?
• Which method do you use to solve the system of equations #y=1/4x-14# and #y=19/8x+7#?
• What are the 2 numbers if the sum is 70 and they differ by 11?
• How do you solve #x+y=5# and #3x+y=15# using the substitution method?
• What is the point of intersection of the lines #x+2y=4# and #-x-3y=-7#?