Solve by substitution. Check the solution. y=3x+1
2x+y=-4

solution (_,_)

check in 1st eq:

check in 2nd eq:

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?