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pychu [463]
3 years ago
9

Solve 7x+3y=8 and 4x-y=-9 simultaneously

Mathematics
1 answer:
Jobisdone [24]3 years ago
5 0

Answer: x = -1 and y = 5

Step-by-step explanation:

7x + 3y = 8 ........................... equation 1

4x - y = - 9 ............................ equation 2

Solving the simultaneous linear equation by substitution method , make y the subject of the formula from equation 2 , we have

y = 4x + 9 ............................. equation 3

substitute y = 4x + 9 into equation 1 , we have;

7x + 3 ( 4x + 9 ) = 8

7x + 12x + 27 = 8

19x + 27 = 8

subtract 27 from both sides

19x = -19

divide through by 19

x = -1

substitute x = -1 into equation 3 , we have

y = 4 ( -1) + 9

y = -4 + 9

y = 5

Therefore :

x = -1 and y = 5

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3 years ago
Carl earns $3.25 per hour walking his neighbor's dogs. He walks them 1/3 of an house in the morning and 1/2 of an hour is the af
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5/6

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You just need to ad 1/3 and 1/2 which would equal 5/6

8 0
3 years ago
A mutual funds company’s newsletter says, "A well-diversified portfolio includes assets with low correlations." The newsletter i
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8 0
3 years ago
I'm marking brainiest if you help me :)
inn [45]

Answer:

the possible line of best fit equation is;

y = 10x + 24

Step-by-step explanation:

Here, we want to get the approximate line of best fit

Mathematically, we have the general line of best fit as

y = mx + b

where m is the slope and b is the y-intercept

By joining the given lines, we can see that the y-intercept values fall a little below 30

This means that the possible y-intercept value is 24

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8 0
3 years ago
GCF and LCM what is it and what do i have to do
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GCF is the Greatest Common Factor. It would be the largest number that can divide evenly into all the numbers you need to find the GCF in.

exapmple GCF for 12 and 16

12: 1, 2, 3, 4, 6, 12

16: 1, 2, 4, 8, 16

the largest common number is 4, so 4 is the GCF of 12 & 16


LCM = Least Common Multiple is the smallest number ( other than zero) that is a multiple of both

LCM of 3 and 5

3: 3, 6, 9, 12, 15, 18
5: 5, 10, 15, 20
 the first common number is 15, so this is the LCM of 3 & 5


6 0
3 years ago
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