Answer:
C. (-3, -2)
Explanation:
Ok so since you are given the second equation with a variable by itself on one side of the equal sign, you can use substitution.
In the first equation, whenever you see a y, plug in x+1 instead of the y.
so: 5x + 7(x+1) = -29
Then you distribute the 7 to bother terms to simplify
5x + 7x + 7 = -29
Combine like terms next
12x + 7 = -29
Then, subtract 7 from both sides to get the 12x on its own
12x = -36
Then to get x by itself you divide by 12
x = -3
Now you have the x value, and you find the y value to complete the solution by plugging the x value into one of the given equations. I'll use the second because it is the simplest.
y = -3 + 1
y = -2
your solution is (-3, -2)