08-04-2015
Mathematics

Answered

Solve by substitution:
2x-y = -5
-x+-y =10

Answer :

Аноним Аноним

08-04-2015

2x-y=-5
-x-y=10
3x=-15
x=-5
-10-y=-5
-y=-5+10
-y=5
y=-5
HOPE I HELPED!!!

Answer Link

08-04-2015

{2x-y = -5 => -y=-5-2x /*(-1) y=2x+5
{-x+-y =10

Substitute y in the second equation:

-x-y=10

-x-(2x+5)=10

-x-2x-5=10

-3x-5=10 /+5

-3x=15 /:(-3)

x=-5

y=2x+5=2*(-5)+5=-10+5=-5

y=-5

Solution: (-5; -5)

Answer Link

Other Questions

x plus three and one sixth equals one and five sixths

How many kilometers is 5.82 x 10⁴ cm?

What did the Puritans believe to be their purpose in coming to America (their "mission"), and how did church and state cooperate to achieve this goal?

What is the percent of change for 8 feet to20 feet

A toaster oven uses 67,500 joules of energy in 45 seconds to toast a piece of bread. What is the power of the oven?

mama explain to cassie that big ma forced her to apologize to avoid bodily harm she tells cassie that she has to grow up.what does mama mean by this?

What did the Puritans believe to be their purpose in coming to America (their "mission"), and how did church and state cooperate to achieve this goal?

Why did so many people invest in the stock market in the 1920s?

to feel bad that someone is absent

what are some spanish words that start with x