Answer:

Step-by-step explanation:


We are going to do a replacement of x for a second equation
So instead

in the place of x we are putting 12-y from the first equation, so

To leave the brackets we need to do multiplication

Which is


How to determine x? From the first equation:
If the x +y = 12 then the x = 12-y so x = 12-7 = 5
We should write solution as a pair:

Answer:
the answer is -i
Step-by-step explanation:
Answer:
2 is the asnwer hard to explain have a good TEST!!
Step-by-step explanation:
y = 3
x = -2
These are the solutions after elimination
Answer:
the answer will be
50
Step-by-step explanation:
5 x 10= 50