Please help with question

Mathematics

2 answers:

lara31 [8.8K]3 years ago

8 0

(a) = (-6,0)

(b) = (-12,5)

Tresset [83]3 years ago

4 0

Hello!

You put in the know values for x or y
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(-6, ?)

We know that x is -6

6y + 5(-6) = -30

Combine like terms

6y + -30 = -30

Add 30 to both sides

6y = 0

y = 0
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(?, 5)

We know that y is 5

6(5) + 5x = -30

Combine like terms

30 + 5x = -30

Subtract 30 from both sides

5x = -60

Divide both sides by 5

x = -12
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The answers are (-6, 0) and (-12, 5)

Hope this helps!

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3 years ago

-9.3x+8.6y=45.1<br> 7.1x+1.7y=-17.9<br> What is x and y?

Veseljchak [2.6K]

Answer:

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

Step-by-step explanation:

For equations that involve tedious math, I like to let a graphing calculator do it. The solution is ...

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

_____

Fully equivalent to solution by elimination is the use of Cramer's rule. It tells you ...

Δ = (-9.3)(1.7) -(7.1)(8.6) = -76.87