Pls help will give brainliest and be very detailed. What is 11+9

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

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Urgent? will give brainliest to the first correct answer what is the area of the figure?