All categories

2 years ago

What is the x value in the soulution to this system of linear equation 2x-y=11 x+3y=-5

Mathematics

1 answer:

ollegr [7]2 years ago

7 0

Answer:x=7

Step-by-step explanation:

2x-y=11 equation1

x+3y=-5 equation2

multiplying equation 2 by 2 in order to cancel x

2(x+3y=-5)

2x+6y=-10 equation 3

subtacting equation 1 and 3

2x-2x-y-6y=11-(-10)

-7y=21

y=-3

put the value of y in equation 1 to find the value of x

2x-(-3)=11

2x=11+3

2x=14

x=7

You might be interested in

**PLEASE HELP** Jake earns $7.50 per hour working at a local car wash. The function, ƒ(x) = 7.50x, relates the amount Jake earns

BARSIC [14]

X=2y/15
2x/15 is the inverse

8 0

3 years ago

Read 2 more answers

Can someone try doing this plz

Svetach [21]

Answer:

Step-by-step explanation:

Your welcome my guy :D

5 0

2 years ago

Read 2 more answers

If f(x)=-9x-3, find f(-5)

Andrews [41]

Answer:

Step-by-step explanation:

f(-5) = -9 × (-5) - 3 = 45 - 3 = 42

If you have any questions about the way I solved it, don't hesitate to ask me in the comments below =)

5 0

2 years ago

Help me plz guys for 14 point

strojnjashka [21]

I think its true, since perimeter is the diatance around. I would say mines correct, but you could try. I hope that helped atleast a little. :)

8 0

2 years ago

He cost, in millions of dollars, of building a three-story high school in new york state was estimated to be c(x) = 2.1 + 0.12x

ratelena [41]

Given cost function is

c(x) = $2.1 + 0.12x - 0.0001x^2$ (20 ≤ x ≤ 400)

where x is the number of thousands of square feet

total revenue will be $0.2 million dollars per thousand square feet

Revenue is 0.2 millions per thousand square feet. we know x is the number of thousand of square feet

So R(x) = 0.2x

We know Profit = Revenue - Cost

P(x) = R(x) - C(x)

$P(x) = 0.2x - (2.1 + 0.12x - 0.0001x^2)$

$P(x) = 0.2x - 2.1 - 0.12x + 0.0001x^2)$

combine like terms

$P(x) =-2.1 + 0.08x + 0.0001x^2$

Profit function is

$P(x) =0.0001x^2 + 0.08x - 2.1$

5 0

3 years ago