Question

solving linear systems using substitution method

2x+y=9
x+y=4

Answer 1

2x+y=9
-2(x+y=4
so
2x+y=9
-2x-2y=-8
cross out the x's
-1y=1
y=-1
then just use the first problem and put in the y to get the x and wuallah!

Answer 2

i dont understand , can you draw it out ?

Answer 3

i just did it lol

Answer 4

after -2x+y=-8 i added +2 on both sides and got -2y over 2 + 10 over 2 and i came out with 10 over 2 equals 5