trackboy trackboy

25-02-2016
Mathematics

contestada

What is-2x+6y=6 7x+8y=-6?

Respuesta :

dhgurwls dhgurwls

25-02-2016

we can solve this by substitution

-2x=6-6y

-2x/-2=(6-6y)/-2
x= -3+3y

7(-3+3y)+8y=-6
-21+21y+8y=-6
29y=15
y=15/29

-2x+6(15/29)=6
-2x+90/29=6
-2x=6-90/29
-2x= 174/29-90/29
-2x= 84/29
-2x(29)=(84/29)29
-54x=84
x= -84/54
x= -14/9

so x= -14/9
y= 15/29

Answer Link

Otras preguntas

there are 19 identical socks how many pairs of socks are there will there be any socks without a match if so how many

2+2÷4×11+45-12+1+1+1×0÷11+0=

Percentage of Americans Aged 65 and Older In 1900 = 4% In 1950 = 8.2% In 2000 = 12.4% In 2050 = 20.2% Based on this information, what is happening to the U.S. p

choose three numbers from 1 to 6. Write the numbers in an addition sentence. Show two ways to find the sum.

write a decimal that is 1\10 of 3.0

The Battle of Gettysburg began when Union troops ran into Confederates who were looking for _____. ammunition food water shoes

Unscramble this name it has to do with the Egyptian structures HXSNPI NLASCA

In what ways did Quakers draw attention to the issue of abolition? by raiding British government buildings by boycotting slave-grown sugar by writing petitions

Arrange the events from the poem “The Raven” by Edgar Allan Poe in the correct order. The speaker starts feeling drowsy when he hears a tapping at the window. T

What was the Mayflower Compact? a.the ship that transported the Pilgrims to America b.the colonial legislature of Virginia c.the agreement in which the Pilgrims