picapaleta3 picapaleta3

21-03-2015
Mathematics

Answered

solve this 3x + 4y = 8 & 4.5x + 6y=12

Answer :

baonguyenq1999 baonguyenq1999

21-03-2015

3x+4y=8
4y=-3x+8
divide both sides by 4
y=-3/4x+2
plug y=-3/4x+2 in 3x+4y=8
-> 4.5x+6(-3/4x+2)=12
4.5x-9/2x+12=12
decimal 9/2x=4.5x
4.5x-4.5x+12=12
x=0
plug x=0 in 3x+4y=8
4y=8
y=2

Answer Link

Hippalectryon Hippalectryon

21-03-2015

Multiply the first equality by 3/2 and you get the second

There are thus an infinite number of solutions : x can be any number and y=2-3x/4

Answer Link

Other Questions

Write a short counterclaim for the claim Michelle Obama is making in these remarks to the Grocery Manufacturers Association. But your role in helping address ch

Which of these has a y-intercept of (0,7)? Is it (A) f(x)=7(x-1)(x+5) (B) f(x)=3x(x-7) (C) f(x)=xx+2x+7

Which term describes a physical structure that allows the organism to survive in its particular environment? A. population B. evolution C. adaptation D. ecosyst

Which are rights guaranteed by the Magna Carta? Choose all answers that are correct. A. All serfs throughout England were freed from any further obligation to t

What is a group of bats called

What change did the Aryans bring to India? a. they brought hinduism with them b. they replaced a peaceful culture with a warlike one c. they brought sanskrit wi

the y-axis of a graph gives the units for the Control variable Dependent variable Measurement variable Independent variable

what force keeps an object moving in a circle

How do basophil cells react when a pathogen enters the body?

List the rights that the nazi government took from the Jews.