Question 49316
Solve by substitution:
1) {{{x+y = 12}}}
2) {{{y = 2x}}} Substitute this into equation 1)

1a) {{{x+(2x) = 12}}} Simplify and solve for x.
1b) {{{3x = 12}}} Divide both sides by 3.
1c) {{{x = 4}}} Now substitute this into equation 2) and solve for y.

2a) {{{y = 2(4)}}} Simplify.
2b) {{{y = 8}}}

Solution is: (4, 8)