yutongliang910 yutongliang910

25-07-2021
Mathematics

contestada

3x + ky = 8
X – 2ky = 5
are simultaneous equations where k is a constant.
a) Show that x = 3.
b) Given that y = 1/2 determine the value of k.

Relax

Respuesta :

Аноним Аноним

25-07-2021

Answer:

a) 3x + ky = 8

ky = 8 - 3x

x – 2ky = 5

x - 2(8 - 3x) = 5

x - 16 + 6x = 5

7x = 21

x = 3 (shown)

b) x-2ky = 5

sub x = 3, y = 1/2

3-2k(1/2) = 5

-2k = 2

k = -1

Answer Link

Otras preguntas

Count on 5 tens 34, , ,

triangular region at the mouth of a river: it is rich in minerals which help to enrich the soil for farming

I need help solving this equation 26=8 + v

Write a paragraph to explain the pattern of volcanoes around the world.

What is a value or values that make an equation true

A map measuring 60 cm by 25 cm is reduced twice in the ratio 3:5. Calculate the final dimensions of the map.

What happens when a ray of light hits a mirror? Detailed answer please :)

The effect of alcohol varies from one person to another, mostly because it depends on the blood alcohol concentration, or BAC. What does blood alcohol concentra

why was the nile river well suited for settelments

What does multiplicative pattern mean?