5. Just do 9 minus 4. 5 plus 4 equals 9
If: x+(-5) = 4 Then: x = 9
5
x = 4
-4 (-9 +5 = -4)
-4
x=4
no...why would it.... it equals 2x+9
x + 5 - 2x = 9 -x = 4 x = -4
x=4 y=5 9x+7y=?? Replace: 9(4)+7(5)= 71
9 plus 7 equals 144. Generally, x plus y = x(x+y).
5x + 13