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lilavasa [31]
2 years ago
14

Solve the system by elimination x-3.1y=11.5 -x+3.5y=-13.5

Mathematics
1 answer:
QveST [7]2 years ago
5 0

Answer:

solving the given equation,

x-3.1y=11.5

-x+3.5y=-13.5

----------------------

0.4y= -2.5

or, y= -2.5÷0.4

or, y= -6.25

put the value of y in first eqn

x-3.1×(-6.25)=11.5

or, x+ 19.375=11.5

or, x= 11.5-19.375

or, x = -7.875

therefore x = -7.875 and y= -6.25ans.

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-1/2 + 4/9
stira [4]

Answer:

-1/18

Step-by-step explanation:

First, you have to change both fractions to have like denominators. The LCM of 2 and 9 is 18.

Second, you have to multiply -1/2 by 9/9 to get a denominator of 18. -1/2 x 9/9 is - 9/18.

Third, you have to multiply 4/9 by 2/2 to get a denominator of 18. 4/9 x 2/2 = 8/18.

Fourth, -9/18 + 8/18 = -1/18

Hope this helps!

4 0
2 years ago
Estimate and then find the sum
tekilochka [14]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
Read 2 more answers
-Find the y-intercept of the line with the equation 2x+y=5.
AlekseyPX

Answer:

E.  5

Step-by-step explanation:

Let's rewrite the equation in the form of y=mx+b, where m is the slope and b is the y-intercept (the value of y when x = 0).

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y = -2x+5

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<u>5, b, is the y-intercept</u>

See attached graph.

8 0
1 year ago
Find the leg of each isosceles right triangle when the hypotenuse is 5 square root 6
kozerog [31]
Hypotenuse = 5√6

Let the length of each leg be x, since it is Isosceles .

x² + x² = (5√6)²

2x² = (5 * 5 * √6 * √6)

2x² = 150

x² = 150/2

x² = 75

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x = √25 * √3

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5 0
3 years ago
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AURORKA [14]

Answer:

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Step-by-step explanation:

\frac{7+(2+6)^{2} }{4(\frac{1}{2} )^{2} }

=284

3 0
3 years ago
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