Question

(-3,-9) is a solution or not a solution

Answer 1

According to the given data we have the following system of equations:

7x+5y=-7

9x-2y= -9

x?

y?

In order to calculate both x and y we would have to make the following calculation:

7x+5y=-7

7x=-7-5y

x=(-7-5y)/7

x=-1-5y/7

So, we gonna subsitue the value x=-1-5y/7 in the equation 7x+5y=-7 as follows: