HELP ASAP WILL MARK BRAINLIEST

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11