Question

Which of the following systems of equations has no solution? Answer

9x + 5y = 1; 15y = 18x − 4

-7x − 7 = 3y; -14y − 8 = -6x

4x − 3y = 9; 6y = 8x − 18

7y = 5x − 10; 10x − 14y = 8

Answer 1

see if any of equation in a system is a multiple of the other
if so that your answer

Answer 2

you'll need to rearrange in order to make is obvious

Answer 3

for example 2nd option
write in form ax + by = n
-7x - 3y = 7
-6x + 14y = -8

one is not multiply by other

Answer 4

do you follow that?

Answer 5

Another reasonably quick way is to calculate the determinant. If it's not equal to 0, there is a solution.

Answer 6

right

Answer 7

and determinant of a equation
and if