Question

What value of "a" makes the system 3x-y=17 and ax+y=-7 have no solution?

Answer 1

Answer:

y=-7-ax

3x-(-7-ax)=17

3x+7+ax=17

3x+ax=10

x(3+a)=10

x=10,3+a=10 a=10-3 a=7