13. for what value of b would the following system of equations have an infinite number of solutions?
9x + 12y = 21
6x + 8y = 7b
explain and show steps : )

b=2

Step-by-step explanation:

we have

9x+12y=21 > equation A

6x+8y=7b > equation B

we know that

If the system of equations have an infinite number of solutions then the equation A must be equal to the equation B

Multiply equation B by 1.5 both sides

1.5*[6x+8y[=7b*1.5

9x+12y=10.5b > equation C

Compare equation A and equation C

9x+12y=21 > equation A

9x+12y=10.5b > equation C

For the equations to be equal it must be fulfilled that

21=10.5b

solve for b

b=21/10.5

b=2

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844

not me

step-by-step explanation:

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