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blondinia [14]
3 years ago
14

Solve the equation. Then check your solution.

Mathematics
2 answers:
ElenaW [278]3 years ago
7 0

Step-by-step explanation:

4/5+x=3/7

x=3/7-4/5

x=15-28/35

x= -13/35 option D

const2013 [10]3 years ago
3 0

Answer:

(d) -13/35

Step-by-step explanation:

\cfrac{4}{5} + x = \cfrac{3}{7}  \\ \\ \\ x = \cfrac{3}{7} - \cfrac{4}{5}\\ \\ \\  x = \cfrac{3 \times 5}{7 \times 5} - \cfrac{4 \times 7}{5 \times 7} \\ \\ \\  x = \cfrac{15}{35} - \cfrac{28}{35} \\ \\ \\ x = \cfrac{-13}{35} \\ \\ \\ x = -\cfrac{13}{35}

Answer : (d) -13/35

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Please help how to do this
Mrac [35]

Answer:

Frumpyton

Step-by-step explanation:

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6 0
3 years ago
Solve 5x+4y=-30<br> 3x-9y=-18<br> Solve using the elimination method
jenyasd209 [6]

Answer:

  (x, y) = (-6, 0)

Step-by-step explanation:

The y-coefficients have opposite signs, so we can eliminate y-terms by multiplying both equations by a positive number and adding the results.

9 times the first equation plus 4 times the second gives ...

  9(5x +4y) +4(3x -9y) = 9(-30) +4(-18)

  45x +36y +12x -36y = -270 -72 . . . . eliminate parentheses

  57x = -342 . . . . . collect terms

  x = -6 . . . . . . . divide by the coefficient of x

__

Substituting into the first equation gives ...

  5(-6) +4y = -30

  4y = 0 . . . . . . . . . add 30

  y = 0

The solution is (x, y) = (-6, 0).

4 0
3 years ago
How many real number solutoins does the equation have? -8x^2 + 8x - 2 = 0
Yanka [14]

Answer:

one

Step-by-step explanation:

for general form : ax²+bx+c=0

delta = b²-4ac

so for this example delta is 8²-4×2×8 =0

we know if delta = 0 , we have just one real number solution

so the answer is 1

4 0
3 years ago
If Y varies directly with X solve the following :
tresset_1 [31]

Answer:

B) When Y = 90

X = 90 x -3

= -270

C) When X = -8

Y = 33.6(approx.)

D) When Y = 12.6

X = 12.6 x 3

= 37.8

Hope this helps!

4 0
4 years ago
For the equation below, what should be added to both sides of the equation to make the left hand side a Perfect Square Trinomial
Evgesh-ka [11]

Answer:

6

Step-by-step explanation:

8 0
3 years ago
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