Question

find the values of a for which the given pair of linear equations ax+9y+10=0 and 12+12a y+3a-31=0 has infinite solutions​

Answer 1

Step-by-step explanation:

a/12=9/12a=10/3a-31

a^2=9

a=3 or a=-3

for a=3

3/12=10/-22

which is wrong therefore a=3 is not solution

for a=-3

-3/12=9/-36=10/-40

a=-3 is solution