Which equation has no solution? a. 5m-6=5m+7-m b. 3w+4-w=5w-2(w-2) c. 7y+9=7y-6 d. 4z+8=-4z-2

C. Because 7y -7y = -15
0 = -15

The equation which has no solution is:

                           Option: C

           c)        

Step-by-step explanation:

The equation is said to have a no solution if we get a false identity on solving the equation.

a)

On combining the like terms in the right hand side of the equation we have:

Hence, we get a unique solution to the equation.

b)

on using the distributive property in the right hand side of the equation we have:

Again we get a unique solution to the equation.

c)

on subtracting 7y from both the sides of the equation we have:

which is a false identity.

Hence, the equation has no solution.

d)

This equation has a unique solution.

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!

The answer is 180ohohohoho