The solutions for the linear equations are:
A) x = 10
B) x = 40
C) x = 11.42
D) x = 5
How to solve these equations?
To solve linear equations we need to isolate the variables, so let's do that:
A) 3x - 5 = 25
We add 5 in both sides:
3x - 5 + 5 = 25 + 5
3x = 30
Now divide both sides by 3:
3x/3 = 30/3
x = 10
That is the method we need to use, just apply the same operation in both sides until the variable is isolated. Now let's complete the other ones.
B)
2x = 40 + x
2x -x = 40
x = 40
C) 8x - 10 = 70 + x
8x - x = 70 + 10
7x = 80
x = 80/7
x = 11.42
D) 2x + 20 = 30
2x = 30 - 20
2x = 10
x = 10/2
x = 5