laylalucia12 laylalucia12
  • 26-02-2021
  • Mathematics
contestada

Solve the simultaneous equations
4x + y = 20
x - y = 15

Respuesta :

NinjaNoir
NinjaNoir NinjaNoir
  • 26-02-2021

Answer:

X=7

y= -8

Step-by-step explanation:

4x+y+(x-y)=20+15

4x+y+x-y=35

plus y and minus y cancels out.

4x+X= 35

5x=35

X= 7

Substitute X=7 in any equation

x-y=15

7-y=15

y=-8

Answer Link

Otras preguntas

sin 86° > sin 58° is it true or false
How do Lincoln and Lee feel about secession?
Terms describe the nationalist movement that sought to create a nation-state for the Jewish people
12. Which of the following accurately describes semiconductor diodes? A. Point-contact diodes are more likely to be used as rectifiers than junction diode
The width of a rectangle is two-thirds of its length, and its area is 216 square meters. What is the length? is it 27 or 12
a trumpet vine is currently 16 inches tall planted next to a 4-foot fence. the trumpet vine grows at an average rate of 1/2 inch per day. at that rate, how many
Cohesion describes water's
what number must be added to both sides of the equation to complete the square ? X^2+12x=-6 a)-144 b)36 c)-36 d)144
Chemosynthetic get their bacter from what
A lawnmower runs on gasoline.what type of energy transformation takes place in its engine?