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2 years ago

Can some one plz help me with these 2 problems

Mathematics

1 answer:

natulia [17]2 years ago

7 0

The right answer of 1st question is (4*30)+(4*8).[Option C]

The right answer of 2nd question is 35.

Look at the attached picture

Hope it will help you...

Good luck on your assignment...

~pragya

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Answer:

The answer that gives the best estimate is (1,1)

Step-by-step explanation:

i) As can be seen on of the lines intercepts the y axis at (0,-1). So the y

intercept or $c_{1}$ = -1. Therefore the equation for this line can be written as

y = $m_{1}$ x + $c_{1}$ ⇒ y = $m_{1}$ x - 1 . It can also be seen from this graph that the

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can be written as y = $\frac{3}{2}$ x - 1 ⇒ 2y - 3x = -2

ii) As can be seen on the other line the intercept on the y axis is at (0,2). So

the y intercept or $c_{2}$ = 2. Therefore the equation for this line can be

written as y = $m_{2}$ x + $c_{2}$ ⇒ y = $m_{2}$ x + 2 . It can also be seen from this

graph that the line passes through the point (1 , -1). Substituting these

values for x and y respectively we get 1 = 1 $m_{2}$ + 2 ∴ $m_{2}$ = -1 . The

equation of the second line can be written as y = - x + 2 or x + y = 2

iii) Solving the two equations of the two lines respectively as found in i) and

ii) we get y = 0.8. We multiply equation in ii) by 3 to get 3x + 3y = 6 and

when we add this to equation in i) we get 5y = 4 which means that y = 0.8.

If we substitute this value in ii) we get 0.8 + x = 2 , therefore x = 1.2.

iv) Therefore we get the solution of the two lines, which is the intersection

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