Use substitution to solve the system

{y=2x-4
{6x+4y=12

Write a story that matches with the expression 42x-5 pls hurry

1. if we have 3 babies what is the probability they’re going to be all boys? 2. if we roll 2 die at the same time what is the probability of getting less than 10 on the first roll and a 5 on the second roll 3. if we have 3 babies what is the probability their is going to be 2 girls? 4. if we have 3 babies what is the probability of having no more than 1 girl? 5. it we have 3 babies and then have another 3 babies what is the probability of us having at least 1 boy and then having all girls?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?