Answer
to solve, plug the value of the variables in each equation in the system
(1,2) means x = 1 and y = 2
y = -2x + 4
2 = -2(1) + 4
2 = -2 + 4
2 = 2
the ordered pair is a solution to the first equation
7x - 2y = 3
7(1) - 2(2) = 3
7 - 4 = 3
3 = 3
the ordered pair is a solution for the second equation
Because the ordered pair is a solution for BOTH equations in the system, it is a solution to the system. Therefore, the correct answers are:
"When (1,2) is substituted into the first equation, the equation is true."
"The ordered pair (1,2) is a solution to the system of linear equations."
"When (1,2) is substituted into the second equation, the equation is true."
Hope this helps!