4x-5 = 0 what is the value of x

x=5/4

Step-by-step explanation:

Isolate x!

4x=5

x=5/4

x = 5/4

Step-by-step explanation:

4x-5 = 0

Add 5 to each side

4x-5+5 = 0+5

4x = 5

Divide each side by 4

4x/4 = 5/4

x = 5/4

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.