Henrique began to solve a system of linear equations
using the linear combination method. His work is shown
below:
Complete the steps used to solve a system of linear
equations by substituting the value of y into one of the
original equations to find the value of x.
What is the solution to the system?
1. 3(4x - 7y = 28) -- 12x - 21y = 84
-2(6x - 5y = 31) ---12x + 10y = -62
2. 12x - 21y = 84
+ -12x + 10y = -62
-11y = 22
3. y=-2