Question

1. Solve the system by substitution
2x+y=-11
3x-4y=11

A. (3,5)
B. (-5,-3)
C. (-3,-5)
D. (5,3)

Answer 1

2x+y=-11
y=-2x-11

3x-4(-2x-11)=11
Now, solve the above equation

Answer 2

Look, we have :
2x+y=-11
3x-4y=11
________________________
+4(2x+y=-11)
3x-4y=11
________________
have :
8x+4y=-44
3x-4y=11
Sum them :
8x+4y+3x-4y
-44+11
have :
11x=-33
and x=3
To find y you can get 3 to x in one of the equations and find that :)

Answer 3

3. What is the solution of the following system?
-3x-2y=-12
9x+6y=-9


A. (2, 1)
B. no solutions
C. (–2, –1)
D. infinitely many solutions

Answer 4

Thanks