Question

Solve the following system of equations.

2x + y = 3

x = 2y - 1

Answer 1

solve by rearranging the equations using algebra and substitution.
2X+Y = 3
2x = 3-y (subtract y from both sides)
x= (3-y)/2 (divide both sides by 2)

x=2y-1 (second equation)
(3-y)/2=2y-1 (substitute from above prob)
3-y=4y-2 (multiply both sides by 2)
3+2=5y (add two and add y to both sides of the equation)
5=5y
y=1

Answer 2

oh, and x=(3-y)/2,
so if y=1, then
x=(3-1)/2=2/2=1