2 years ago

Solve the system by substitution. −7x−10y= 40 x=−2y

Mathematics

1 answer:

Harrizon [31]2 years ago

5 0

Answer:

x= -20, y= 10

Step-by-step explanation:

Label the two equations:

-7x -10y= 40 -----(1)

x= -2y -----(2)

Substitute (2) into (1):

-7(-2y) -10y= 40

Expand:

14y -10y= 40

Simplify:

4y= 40

Divide both sides by 4:

y= 40 ÷4

y= 10

Substitute y= 10 into (2):

x= -2y

x= -2(10)

x= -20

You might be interested in

What number must you add to complete the square?<br><br> x^2-10x=46

gtnhenbr [62]

X² - 10x = 46
10/2 = 5; 5²+ 25 add 25 to both sides

x² - 10x + 25 = 46 + 25

so the number you have to add to complete the square is 25.

5 0

3 years ago

NEED HELP ASAP!!!!!!!

bija089 [108]

The answer would be C

4 0

3 years ago

Jackie follow the steps to elevate the expression 15 - (37 + 8) divide 3 37 + 8 = 45 45-15= 30 30 divided by 3 = 10 Mark looks a

damaskus [11]

Answer:

So, we conclude that Mark is right.

Step-by-step explanation:

If we have the following expression: 15 - (37 + 8) : 3.

We will first divide the value we get in parentheses and then subtract it.

Because sharing is an older mathematical operation than subtraction. Therefore, we get:

$15-(37+8):3=15-45:3=15-15=0$

So, we conclude that Mark is right.

3 0

3 years ago

One week the music store sold 2 trumpets, 3 clarinets, and 5 violins for $1,240. The next week, they sold 3 trumpets, 1 clarinet

garik1379 [7]

Answer:

Cost of Trumpets: $174

Cost of Clarinets: $149

Cost of Violins: $89

Step-by-step explanation:

Got it correct

4 0

3 years ago

A truck with a heavy load drove from Boston to New York at 45 mph. After unloading, it returned from New York to Boston at a spe

Ksju [112]

Average speed is 53

4 0

3 years ago

Read 2 more answers