Question

Kyle is asked to solve a system of equations by substitution:

2x + 3y = 12
x - 2y = 4

Which step should Kyle take first? Why?

Answer 1

see explanation

Explanation:

2x + 3y = 12 → (1)

x - 2y = 4 ( add 2y to both sides )

x = 2y + 4 → (2)

now he can substitute x = 2y + 4 into (1)