Which expression can be used to find the difference of the polynomials? (10m – 6) – (7m – 4)

a [10m + (–7m)] + [(–6) + 4]
b (10m + 7m) + [(–6) + (–4)]
c [(–10m) + (–7m)] + (6 + 4)
d [10m + (–7m)] + [6 + (–4)]

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