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nalin [4]
3 years ago
13

Solve the simultaneous equations.

Mathematics
1 answer:
Vera_Pavlovna [14]3 years ago
4 0

Answer:

x = 1.5  ; y = -0.5

Step-by-step explanation:

2x + 4y = 1  ---------------------(i)

3x - 5y =7 ----------------------(ii)

(i) * 5      10x + 20y = 5

(ii)*4      <u> 12x  -20y = 28  </u>    

add,         22x        = 33          { here y will be eliminated}

                           x = 33/22 = 3/2

                           x = 1.5

Put the value of x in equation (i)

2*1.5 + 4y = 1

3 + 4y = 1

4y = 1-3

4y = -2

y  = -2/4 = -1/2

y = -0.5

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9514 1404 393

Answer:

  A

Step-by-step explanation:

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The only graph with its vertex at x=-4/3 is graph A.

_____

<em>Additional comment</em>

You can also make the correct choice by evaluating the equation at a couple of different values of x. Convenient ones are x= -1, or 0, or +1. The value at x=0 is the y-intercept, (0, -2), which seems to be a point on all of the graphs. The value at x=1 is 3/2+4-2 = 3.5, which looks like it is only seen on graph A.

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3 years ago
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1. Find two numbers with a common factor of 3 only.
Mnenie [13.5K]

Answer:

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3 years ago
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