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.

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

Suppose it took 19 riders a total of 11 days 21 hours to ride from St. Joseph to Sacramento. If they all rode the same number of hours, how many hours did each

which is part of ethnic nationalism and separatism?

Two other ways to write 8.517 ,0.326 ,0.924 ,and1.075

A ______ is a written statement that promises a product will work for a set amount of time.

why do scientists use the international system of units (si)

what type of relationship do two people who work the same job share

Who helped found Maryland as a safe place for Catholics

find the selling price of a $270 bicycle with a 24% markup

which became a U.S. territory in the late 1800s A. Puerto Rico B. Virgin Islands C. Dominican Republic D. Haiti

Suki split five dog treats equally among her six dogs. which fraction represents this division