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daser333 [38]
3 years ago
12

Solve 2a5b=-19 3a+5b=9

Mathematics
1 answer:
mel-nik [20]3 years ago
7 0

Answer:

a=28, b=-15

Step-by-step explanation:

Method\ by\ linear\ combinaisons\\\left\{\begin{array}{ccc|c|c|}2a+5b&=&-19&-1&3\\3a+5b&=&9&1&-2\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}a&=&28\\5b&=&-75\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}a&=&28\\b&=&-15\\\end{array}\right.\\

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(HELP) what is 10 1/2 ÷ 9 2/6 = ? (show ur work)
Readme [11.4K]

Answer:

9/8 or 1.125

Step-by-step explanation:

10 1/2 ÷ 9 2/6

= 21/2 ÷ 56/6

= 9/8

= 1.125

=》 See the attachment.

Hope it helps ⚜

8 0
2 years ago
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Round 0.698 to the nearest hundredth.<br> PLZ PLZ HELP
Semmy [17]

Answer:

0.70

Step-by-step explanation:

The nine is in the hundreths place, and it is over five, so you would round the number to the left of it up (the six). Basically, ignore the 8.

4 0
3 years ago
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The cost of 3 tacos and a juice is $7. The cost of 4 tacos and 2 juices is $10. If t = the cost of a taco and j = the cost of a
marin [14]

Answer:

t=2

j=1

Step-by-step explanation:

3 tacos and a juice is $7

3t+j=7

4 tacos and 2 juices is $10

4t+2j=10

We have a simultaneous equation. It can be solved either by substitution method or Elimination method. For the purpose of this question, the elimination method will be used

3t+j=7 Equation 1

4t+2j=10 Equation 2

To eliminate j, we multiply Equation 1 by 2, the coefficient of j in equation 2, so that in both equations, j can have the same coefficient.

2(3t+j=7)

6t+2j=14 Equation 3

We now have

4t+2j=10 Equation 2

6t+2j=14 Equation 3

We subtract equation 2 from equation 3, to eliminate j

6t-4t=2t

2j-2j=0

14-10=4

We have 2t=4

Divide both sides by 2

2t/2=4/2

t=4/2

t=2

Substitute t for 2 in equation 1, to get j

3t+j=7

3(2)+j=7

6+j=7

j=7-6

j=1

One taco cost $2 while 1 juice cost $2

3 0
3 years ago
What should be subtracted from the product of<br>3/7 and 2/5 to get -4/35?​
bonufazy [111]

\implies {\pink {\boxed {\boxed {\purple {\sf { \: x =  \frac{2}{7}}}}}}}

\large\mathfrak{{\pmb{\underline{\red{Step-by-step\:explanation}}{\red{:}}}}}

Let x be the unknown number.

As per the question, we have

\: ( \frac{3}{7}  \times  \frac{2}{5} ) - x =  \frac{ - 4}{35}

➺\: \frac{6}{35}  - x =  \frac{ - 4}{35}

➺\:  - x =    \frac{ - 4}{35}  -  \frac{6}{35}

➺\:  - x =  \frac{ - 4 - 6}{35}

➺\:  - x =  \frac{ - 10}{35}

➺\: x =  \frac{2}{7}

Therefore, \frac{2}{7} should be subtracted from the product of \frac{3}{7} and \frac{2}{5} to get \frac{ - 4}{35}.

\large\mathfrak{{\pmb{\underline{\orange{To\:verify}}{\orange{:}}}}}

\: ( \frac{3}{7}  \times  \frac{2}{5} ) - x =  \frac{ - 4}{35}

➼\: ( \frac{6}{35} ) -  \frac{2}{7}  =  \frac{ - 4}{35}

➼\:  \frac{6}{35}  -  \frac{2 \times 5}{7 \times 5}  =  \frac{ - 4}{35}

➼\:  \frac{6 - 10}{35}  =  \frac{ - 4}{35}

➼\:  \frac{ - 4}{35}  =  \frac{ - 4}{35}

➼\: L.H.S.=R. H. S

\sf\purple{Hence\:verified. }

\huge{\textbf{\textsf{{\orange{My}}{\blue{st}}{\pink{iq}}{\purple{ue}}{\red{35}}{\green{☂}}}}}

3 0
3 years ago
How are 2-D and 3-D objects related to each other in real world​
stich3 [128]

Answer:

You can see 2-D flat shapes on the faces of 3-D objects.

For example: You go to the store and you see a box,

the box has 6 faces. The bottom of the box is one of It's faces which is 2-D.

Step-by-step explanation:

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