C is the answer
ok, first I will solve of them one by one and the steps.
A: 5x - 4 = 11
so first you should add 4 on both sides to balance out the equation. Now the equation is 5x = 15. then divide 5 on both sides. you will get x = 3.
A is false.
B: 4x - 7 = 13
First you add 7 to both sides. 13 + 7 = 20. This means the equation is now: 4x = 20. now divide both sides by four: you will get x = 5 because 20/4 = 5
B is false
C: 3x + 1 =7
First you subtract 1 on both sides. you will get 3x = 6. Now divide 3 on both sides: You will get x = 2
D: 2x + 1 = 9
First you subtract 1 on both sides. The equation is now 2x = 8. divide 2 on both sides: x = 4
D is false.
