All categories

3 years ago

Solve the system of equations using elimination. 2x+5y= (-23) 5x+13y=(-60)

Mathematics

1 answer:

mel-nik [20]3 years ago

3 0

Answer:

x = 1, y = -5

Step-by-step explanation:

2x + 5y = (-23) (1)

5x + 13y = (-60) (2)

Multiply (1) by 5 and (2) by 2 to eliminate x

10x + 25y = -115 (3)

10x + 26y = -120 (4)

Subtract (3) from (4)

26y - 25y = -120 - (-115)

y = -120 + 115

y = -5

Substitute y = -5 into (1)

2x + 5y = (-23)

2x + 5(-5) = -23

2x - 25 = -23

2x = -23 + 25

2x = 2

x = 2/2

x = 1

x = 1, y = -5

You might be interested in

1.7 m+ 3.7 m +3.7 m +3 m +5.9 m

FinnZ [79.3K]

answer:

18 m

step-by-step explanation:

simply add up all the numbers given
1.7 + 3.7 + 3.7 + 3 + 5.9 = 18
then, put the units given

3 0

3 years ago

Read 2 more answers

What is the distant from -2 to 0

lesya [120]

Answer:

Step-by-step explanation:

Please mark me brainliest! :)

8 0

3 years ago

Read 2 more answers

The students at Neverland school were asked to name their favorite type of pet. Of the 635 students surveyed 358 said their favo

ozzi

about 50 students maybe a few less

8 0

3 years ago

What is the classification for this polynomial -3a^2b^5+2a

Anton [14]

$\bf \stackrel{\stackrel{degree}{\stackrel{2+5=7}{\downarrow }}}{-3a^2b^5}+\stackrel{\stackrel{\stackrel{degree}{1}}{\downarrow }}{2a^1}\impliedby \begin{array}{llll} \textit{highest degree of any term is 7}\\ \textit{so is a 7 degree polynomial}\\ \textit{or called a "septic"} \end{array}$

bear in mind that the degree of a polynomial comes from the highest degree of any of its terms, and the degree of a term is the sum of all exponents in the variables.

3 0

3 years ago

Principal Time. Rate<br> $470. 10 days. 9%<br><br> Whats the interest?

Andrej [43]

Principle=P=470
Time=T=10
Rate =R=R=9%

Interest be I

If interest is daily

I=PRT/100
I=470(10)(9)/100
I=4230/10
I=423$

If interest is monthly (30days)

I=(470)(1/3)(9)/100
I=470(3)/100
I=1410/100
I=14.10$

8 0

3 years ago

Read 2 more answers