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Nookie1986 [14]
3 years ago
14

Can someone please help me out with these questions?

Mathematics
1 answer:
Furkat [3]3 years ago
3 0

Given : y = 8 - 9x

(a) we need to find value of y when x = 2

substituting x = 2 in y = 8 -9x , we get :

y = 8 - 9(2)

y = 8 - 18

y = -10

(b) we need to find value of y when x = 0

substituting x = 0 in y = 8 -9x , we get :

y = 8 - 9(0)

y = 8 - 0

y = 8

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I don’t really understand this type of stuff so please help.
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For 1 and 2, you plot both lines, and wherever they intersect is the solution to the system. Given the equation of a line, I think the easiest way to plot it is to find two points on the line, then draw a line through them. For example, if y=5x-1, then when x=0, you get y=-1; when x=1, you get y=4. So plot the points (0, -1) and (1, 4), then strike a line through.

1. Notice that dividing both sides of 2y=10x-2 by 2 returns y=5x-1, same as the first equation. So the system of equations reduces to one equation, which can have an infinite number of solutions. (This is because for any choice of x or y, you can always find a corresponding value for the other variable.)

2. See attached image. 3x-y=2 is given by the purple line.

For 3-6, you have several options. The two simplest methods of solving them are by substitution or elimination.

3. Like with (1), notice that dividing both sides of the first equation by 2 gives x+3y=9, so there will be an infinite number of solutions.

4. (by substitution) Since y=-7x+3, we can replace y in the second equation:

-7x+3+7x=10\implies3=10

but this is false, so there are no solutions to this system.

5. (by substitution) Since x=2y+2, in the first equation we have

-5(2y+2)+3y=-10y-10+3y=-7y-10=11\implies-7y=21\implies y=-3

Then back in the second equation we find

x=2(-3)+2=-6+2=-4

So (-4, -3) is the only solution here.

6. (by substitution) Notice that the left hand sides of both equations are the same, so we end up with 7 = 12, but this is false, so no solution exists.

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18 hope it helped!!



:) be my pleasure! 


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