Question

If m - n = 32 and 3m - 8n - 6 = 0, then 4m - 9n =
a. -8
b.18
c.26
d.38
e.50

Answer 1

so here it is.... solve one of the equations for m and the other for n. Then substitute it into the other equation.

so say we solve equation 1 for m = 32 +n
solve equation 2 for n = (6-3m)/8

now substitute and solve.

Answer 2

now multiply m-n=32 with 3 and solve it with 3m-8n=6
then you will get n=18 sub it in m-n=32 now m=50
now 4m-9n=
4(50)-9(18)=200-162=38