x + 5 = -7
To solve for x, you must isolate it. To do this, you apply the opposite operation to the numbers on the left. And whatever is done on one side, must be done to the other side.
In this example, we would subtract 5 from both sides of the equals sign.
That is,
x + 5 = -7
- 5 -5
x + 0 = -12
So, x = -12
(3, 5)
If: 3x-7+x = 5 Then: x = 3
2
x = 7
Yes. This is a logical deduction based on substitution. if x + y = 7 and y = 5 then the value of 5 can be substituted for y to get x + 5 = 7 which can then be solved to get x = 2, meaning the point (2, 5) is a solution to the line x + y = 7 as it is on that line.
x = 5
7
(3, 5)
7 x 1?
If: 3x-7+x = 5 Then: x = 3
2
x = -2
if 3x+5=x+19 then x=7
x = 7
x = 11/7 and y = 12/7
9 plus 7 equals 144. Generally, x plus y = x(x+y).
Yes. This is a logical deduction based on substitution. if x + y = 7 and y = 5 then the value of 5 can be substituted for y to get x + 5 = 7 which can then be solved to get x = 2, meaning the point (2, 5) is a solution to the line x + y = 7 as it is on that line.