To check if (5,-1) is a solution to the system of linear equations, we substitute the values of x and y into each equation and see if both equations are satisfied:
For the first equation x + y = 4:
Substituting x=5 and y=-1, we get:
5 + (-1) = 4
4 = 4
The first equation is satisfied.
For the second equation 2x + 3y = 7:
Substituting x=5 and y=-1, we get:
2(5) + 3(-1) = 7
10 - 3 = 7
7 = 7
The second equation is also satisfied.
Since both equations are satisfied when x=5 and y=-1, the point (5,-1) is indeed a solution to the system of linear equations.