lyleszacki lyleszacki
  • 02-02-2022
  • Mathematics
contestada

If 2x – 10y = -1 and 5x + 6y = 4 are true equations, what would be the value
of 7x - 4y?

Respuesta :

shahtejas797 shahtejas797
  • 02-02-2022

Answer:

Step-by-step explanation:

If the equations are true, they can be solved simultaneously.

Consider 2x-10y=-1 as Eq1 and 5x+6y=4 as Eq2

Multiplying Eq1 with 3 and Eq2 with 5 we get,

6x-30y=-3 -- Eq3 and 25x+30y=20 -- Eq4

Adding Eq3 and Eq4,

31x=17 Therefore, x=17/31

Plugin x=17/31 in Eq3,

6(17/31)-30y=-3 --- y=13/62

Plug In values of x and y in 7x-4y we get,

7(17/31)-4(13/62) = 3

So the value of 7x-4y = 3.

Answer Link

Otras preguntas

Which is longer 1/4 foot or 1/4 yard
The tully-fisher relation holds that the _____ a spiral galaxy rotates, the _____ it is.
How much heat is absorbed by a 71g iron skillet when its temperature rises from 11oC to 29oC?
When going out for drinks and pintxos with friends in san sebastian, who usually pays?
In 2007, the two most costly components of underage drinking in Florida were
What do macbeth and his wife plan to do to make the witches' predictions come true?
Which one of the following is the transport of the nutrients around the body to where they’re needed? Digestion Nutrients Absorption Metabolism
Apex what does a good credit history do for consumers
Which country was a member of the Central Powers during World War One?
Why does the u.s. house of representatives have more members than the u.s. senate?