Question

3x + 4 = 19 , { 4,5,6,7}

A. 4
B. 5
C. 6
D. 7

Answer 1

@TrojanPoem

Answer 2

plug in the numbers from the set and see which gives you a true equation

Answer 3

for example
is
3*4+4=19 true?

Answer 4

isnt it 16?...

Answer 5

so is 16=19 true or false?

Answer 6

is 16 the same number as 19?

Answer 7

False

Answer 8

right
plug in the next number in the set

Answer 9

i think its 7

Answer 10

is 3*5+4=19 a true equation

Answer 11

so you think 3*7+4=19 is true ?

Answer 12

no

Answer 13

you have
3x+4=19
you are just trying to see which of the possible x values 4,5,6, or 7 are going to give you a true equation here:

3*4+4=19 is false
3*5+4=19 is ?
3*6+4=19 is ?
3*7+4=19 is false

Answer 14

3*5+4 ?

Answer 15

5?

Answer 16

3*5 is 15
and
3*5+4=15+4 which is 19

19=19 is totally true because 19 is 19

Answer 17

so its that one the answer?

Answer 18

did you read this from above:
"you are just trying to see which of the possible x values 4,5,6, or 7 are going to give you a true equation here:"

Answer 19

19=19 is what plugging in 5 gave us
we are already determine 19=19 is true
what doubts do you still have?

Answer 20

ok thanks...

Answer 21

np :)
so you are totally sure the answer is...

Answer 22

5

Answer 23

right! :)

Answer 24

3x + 4 = 19
let 4 be in the other side with negative sign
3x = 19 - 4 = 15
3x = 15 divide over 3
x = 5

Answer 25

thanks!!