How many of these equations have the solution

x

=

12

x

=

12

?

x

-

2

=

10

x

-

2

=

10

x

2

=

24

x

2

=

24

10

-

x

=

2

10

-

x

=

2

2x1=25

2x-1=25

a) x-2=10

b) 2x=24

Two equations have have the solution

x = 12

Question:

How many of these equations have the solution x=12?

x-2=10

2x=24

10-x=2

2x-1=25

Step-by-step explanation:

To determine which of the above equations have x = 12, we would solve for x in each of the equations.

a) x-2=10

Collecting like terms

x = 10+2

x = 12

This equation has x = 12 as a solution

b) 2x = 24

Divide through by coefficient of x which is 2

2x/2 = 24/2

x = 12

This equation has x = 12 as a solution

c) 10-x=2

Collecting like terms

10-2 - x = 0

8 - x = 0

x = 8

d) 2x-1=25

Collecting like terms

2x = 25+1

2x = 26

Divide through by coefficient of x which is 2

2x/2 = 26/2

x = 13

Note: that (b) x2 = 24 from the question isn't clear enough. I used 2x = 24.

If x2 = 24 means x² = 24

Then x = √24 = √ (4*6)

x = 2√6

Then the number of equations that have the solution x = 12 would be 1. That is (a) x-2=10 only