Algebra- Equations and substitution

Question 1

Algebra substitution

a = 5

1. a + 3
2. 5 divide a
3. 4a

Answer 1

1. 8
2. 1
3. 20

Question 2

What is substitution in math algebra?

Answer 2

Substitution is the name given to the process of swapping an algebraic letter for its value. Consider the expression 8 + 4. This can take on a range of values depending on what number actually is. If we are told = 5, we can work out the value of the expression by swapping the for the number 5.

Question 3

Algebra equations

Do you always do the same thing with both sides of the equation?

Answer 3

Yes

Question 4

Algebra Equations
True or false
To get rid of something do the opposite?

Answer 4

True

Question 5

Algebra Equations

Do you keep going until you have a letter on it’s own?

Answer 5

Yes

Question 6

Algebra equations

Solve x + 3 = 7

Answer 6

x = 4

Question 7

Algebra equations

Solve x - 2 = 3

Answer 7

x = 5

Question 8

Algebra equations

Solve 2x = 10

Answer 8

x= 5

Question 9

Algebra equations

Solve x/2 = 4

Answer 9

x = 8

Question 10

Algebra equations

Solve the equation 5x + 2 = 12

Answer 10

x = 2

Question 11

Algebra equations

5x - 7 = 3x + 3

Answer 11

-3 from both sides so 5x - 7 - 3x = 3x + 3 -3x
which equals 2x - 7 = 3
Now add 7 to get the numbers on the other side
2x - 7 + 7 = 3 + 7
which equals 2x = 10
2x divide 2 = 10 divide 2
x = 5