The correct system that could have led to the equation 7x=21 is:
a) 7x+2y=21, -7x-2y=21
In this system, when we add the two equations together to eliminate y variable, we are left with:
7x = 21
Therefore, the answer is option a).
Elimination was used to solve a system of equations.
One of the intermediate steps led to the equation 7x=21. Which of the following systems could have led to this equation?
a) 7x+2y=21, -7x-2y=21
b) 3x+2y=7, 2x-y=7
c) 4x+3y=24, -3x-3y=3
d) 8x-y=15, x+y=-6
1 answer