All categories

3 years ago

-2x-2y=-8 -4x-8y=-20

Mathematics

1 answer:

Citrus2011 [14]3 years ago

8 0

Answer:

-2x-2y=-8

-4x-8y=-20

From the 1st eqn

Dividing through by 2

you have

-x-y=-4

Multiply through by -(minus)

x+y=4

x=4-y

Substitute into eqn 2

-4x-8y=-20

-4(4-y)-8y=-20

-16 + 4y - 8y = -20

-4y = -20 +16

-4y = -4

y= 1

Substitute into any of the other eqn's to get x

x= 4-y

x= 4-1

x=3

You might be interested in

What is the measure of angle y in this figure? Enter your answer in the box. y=__°

Inga [223]

Answer:

sum of angles at a point is equal to 360

so, 360= 163+ x°+ y°+z°

y°=360-163 -x° - z°

y°=197- x° -z°

7 0

3 years ago

Answer will get brainliest

Artemon [7]

1. outcome

2. probability

3. equally likely

4. likely

5. certain

6. unlikely

7. impossible

Hope this helps! If you have any more questions or need further clarification then please comment down below or message me! Good luck!

3 0

3 years ago

ABCDEF is a regular hexagon. AJFGH is a regular pentagon

Ede4ka [16]

Please finish the sentence(s). This doesn’t have enough information. Have a good day

3 0

3 years ago

Write an expression for the verbal phrase:

Slav-nsk [51]

Expression:

2 * x = 15

Hope that helped!

4 0

3 years ago

Read 2 more answers

At Prairieview Middle School, 100 students participate in at least one of three after-school clubs: soccer club, art club, and g

Tresset [83]

Answer:

Step-by-step explanation:

Number of students in soccer club, n(S) = 50

Number of students in Art club, n(A) = 53

Number of students in Gaming club, n(G)

n( $S \cup A\cup G$ ) = 100

n( $S \cap A\cap G$ ) = 9

n( $S \cap A$ ) = 20

n( $A \cap G$ ) = 35

n( $G \cap S$ ) = 29

Formula:

n ( A ∪ B ∪ C ) = n(A) + n(B) + n(C) – n ( A ∩ B ) – n(B ∩ C) – n (A ∩ C) + n( A ∩ B ∩ C )

Putting the values:

100 = 50 + 53 + n(G) - 20 - 35 - 29 + 9

100 = 112 + n(G) - 84

n(G) = 72

Number of students in gaming club only = n(G) - n( $G \cap S$ ) - n( $A \cap G$ ) + n( $S \cap A\cap G$ )

= 72 - 35 - 29 + 9

= 17

6 0

3 years ago