The given values of abscissa and ordinate in the given are that which
when substituted to the values of x and y in the equation will make the
equation true. This means that the left and right-hand side of the equation
will be equal. The established equations should have a basis of,
x + y = c
The equations are,
x + y = 6
Substituting x = 7 and y = -1,
7 + (-1) = 6 ; 6 = 6
The other two equations will be,
2x + y = 13 and,
x + 2y = 5
It is to be noted that countless of equations can be made with the given
solution so long as the equation is valid.
The answer should be 90 degrees
One ways is to find the factors of 36
1,36
2,18
3,12
4,9
6,6
add them
1+36=37
2+18=20
3+12=15 correct
4+9=13
6+6=12
the numbers are 3 nd 12