583hks8to6o9 583hks8to6o9

03-04-2019
Mathematics

contestada

2x+5y=20. , -2x+20y=-90. one solution. infinity many ir no solution. use elimination to find your answer

Respuesta :

03-04-2019

2x+5y=20
X=10-2.5y

-2(10-2.5y)+20y=-90
-20+5y+20y=-90
25y=-70
Y=2.8

2(2.8)+5y=20

5.6+5y=20
5y=14.4
Y=2.88

CHECK:
2(2.8)+5(2.88)=20

Ver imagen xAJHx

Answer Link

Otras preguntas

Decrease £120 by 45%

What hardships did the south face after the civil war????

I would like to know if 1 km is greater or less then 999 m

A box if cereal has a volume of 384 cubic inches . If width of the box is 4 inches and the length is 8 inches , what is the height of the box?

Description of what is an ecosystem

how many yards in a mile?

Who would have supported the two sides in the English Revolution?

What does an acid+base make

__________ means to move from one region to another. When animals regularly move as a group from one region to another and back, it's a ______________.

Two identical capacitors are arranged in a circuit. What is the ratio of the equivalent capacitance of the circuit when the capacitors are in series to that whe