Ask question

Ask question

All categories

3 years ago

5

I need these three solved. I have a lot of math to do. the directions say solve each system of equations using substitution. sho

w mathematical work for each to justify your response.

1 answer:

alekssr [168]3 years ago

6 0

Answer:

5.

x + 2(x + 1) = 8 --> x = 2

y = 2 + 1 = 3

7.

3(9 + 2y) + 5y = 20 --> y = -7/11

x = 9 + 2(-7/11) = 85/11

9.

3(-1 - 2y) + 5y = -1 --> y = -2

x = -1 - 2(-2) = 3

You might be interested in

the sum of −2x2 + x + 31 and 3x2 + 7x − 8 can be written in the form ax2 + bx + c, where a, b, and c are constants. What is the

just olya [345]

Answer:

Part 1) $a=1,b=8,c=23$

part 2) $a+b+c=32$

Step-by-step explanation:

we have

$(-2x^{2} +x+31)+(3x^{2}+7x-8)$

Adds the terms

Group terms that contain the same variable

$(-2x^{2}+3x^{2})+(x+7x)+(31-8)$

Combine like terms

$(x^{2})+(8x)+(23)$

where

$a=1,b=8,c=23$

therefore

$a+b+c=1+8+23=32$

8 0

3 years ago

The number of students in a newly opened school is 210. It is estimated that the number of

motikmotik

Answer:

The answer is 6720

Step-by-step explanation:

(210 x 2) x 2) x 2) x 2) x 2) = 6720

Step by step its:

210 x 2 = 420

420 x 2 = 840

840 x 2 = 1680

1680 x 2 = 3360

3360 x 2 = 6720

5 0

3 years ago

Read 2 more answers

Drag and drop each pair of lines into the correct category to indicate whether the pair of lines are parallel,

Vadim26 [7]

Answer:neither, neither, perpendicular , neither

parallel

Step-by-step explanation:put each line in the form y=mx+b

if m=m they are parallel

if m times m = -1 they are perpendicular

if the m’s are unrelated than neither

5 0

2 years ago

Which one is the correct answer?

Ainat [17]

Answer:

200

Step-by-step explanation:

Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic meter. Plz mark me brainliest!

4 0

2 years ago

Read 2 more answers

Find the volume of the sector please

Nesterboy [21]

Answer:

j

Step-by-step explanation:

i could nit find a answer for tge problem and the answer i got was not on the pic sooo

6 0

3 years ago