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kondor19780726 [428]
3 years ago
6

Using linear combination method what is the solution to the system of linear equations 7X -2Y = -20 and 9X + 4Y = -6

Mathematics
1 answer:
Yakvenalex [24]3 years ago
8 0

Answer:

(x,y ) = ( - 2,3)

Step-by-step explanation:

given the 2 equations

7x - 2y = - 20 (1)

9x + 4y = -6 (2)

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If x-y=1 and xy= 56 then find the value of x+y​
tester [92]

Answer:

x + y = ±15

Step-by-step explanation:

Step 1: Write out systems of equations

x - y = 1

xy = 56

Step 2: Rearrange 1st equation

x = y + 1

Step 3: Substitution

(y + 1)y = 56

Step 4: Distribute

y² + y = 56

Step 5: Solve for <em>y</em>

y² + y - 56 = 0

(y - 7)(y + 8) = 0

y = -8, 7

Step 6: Plug in <em>y </em>to find <em>x</em>

x - 7 = 1

x = 8

x - (-8) = 1

x + 8 = 1

x = -7

Step 7: Find answer

x + y = ?

8 + 7 = 15

-7 + -8 = -15

So both 15 and -15 could be the answer.

3 0
3 years ago
Read 2 more answers
Answer the following: a) 2x32 =<br> b) (2 x 3)2 =
wel

Answer:

a) 64 b) 12

Step-by-step explanation:

32 + 32 = 64

2*3 = 6

6*2 = 12

6 0
3 years ago
Read 2 more answers
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