Solving Linear Equations with 1 variable – Review – Tutorial and Practice Questions


Linear Equations with 1 Variable

 

Quick Review and Tutorial plus Practice Questions and Answer Key

Tutorial   Practice Questions   Answer Key

Quick Review and Tutorial – Solving Linear Equations

Linear equations with variable x is an equation with the following form:

ax = b

where a and b are some real numbers. If a = 0 and b is different from 0, then the equation has no solution.

Let’s solve one simple example of a linear equation with one variable:

4x – 2 = 2x + 6

When we are given this type of equations, we are always moving variables to the one side, and real numbers to the other side of the equals sign. Always remember: if you are changing sides, you are changing signs. Let’s move all variables to the left, and real number to the right side:

4x – 2 2x + 6

4x – 2x = 6 + 2

2x = 8

x = 8/2

x = 4

When 2x goes to the left it becomes now -2x, and -2 goes to the right and becomes +2. After calculations, we find that x is 4, which is a solution of our linear equation.

Let’s solve a little more complex linear equation:

(2x – 6)/4 + 4 = x

2x – 6 + 16 = 4x

2x – 4x = -16 + 6

-2x = -10

x = -10/-2

x = 5

We multiply whole equation by 4, to lose the fractional line. Now we have a simple linear equation. If we change sides, we change the signs. At the end we do the final calculations.

 

Practice Questions

 

1. Solve the linear equation:

-x-7 = -3x-9

a. -1
b. 0
c. 1
d
. 2

2. Solve the linear equation:

3(x+2)-2(1-x) = 4x+5

a. -1
b. 0
c. 1
d
. 2

3. Find the solution for the following linear equation:

 5x/2 = (3x +24)/6

a. -1
b. 0
c. 1
d
. 2

4. If a and b are real numbers, solve the following equation:

(a+2)x-b = -2+(a+b)x

a. -1
b. 0
c. 1
d
. 2

5. Find the solution for the following linear equation:

1/(4x – 2) = 5/6

a. 0.2
b. 0.4
c. 0.6
d. 0.8

 

Answer Key

 

1. A -1

-x-7=-3x-9
-x+3x=-9+7
2x=-2
x=(-2):2
x=-1

2. C 1

3(x+2)-2(1-x)=4x+5
3x+6-2+2x=4x+5
5x+4=4x+5
5x-4x=5-4
x=1

3.  D 2

12

 

 

 

 

 

 


4.  A -1

(a+2)x-b=-2+(a+b)x
ax+2x-b=-2+ax+bx
ax+2x-ax-bx=-2+b
2x-bx=-2+b
(2-b)x=-(2-b)
x=-(2-b):(2-b)
x=-1

5.  D 0.8

Written by:
Modified: August 21st, 2018 August 21st, 2018

Published: November 27th, 2014

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