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andrew-mc [135]
3 years ago
8

(Score for Question 4 of 6 points)

Mathematics
1 answer:
LuckyWell [14K]3 years ago
3 0

Answer:

a) On Desmos.

b)The solution set {-2,-2}

Step-by-step explanation:

For drawing a line on graph we require minimum two points.

we have,

y=2x+2

Put x = 0,we get

y = 2

∴ Let A (0,2)

Similarly

Put y = 0 we get

x = -1

∴ Let B (-1,0)

Now Draw  line AB

For y = -2

It is the line parallel to X axis where Y value is always -2

Now , by drawing these two lines we will get the intersecting point, and this intersecting point is the solution to the system. Let the point be C (-2,-2)

Here we substitute y= -2 in y = 2x + 2 we get

-2 = 2x +2\\2x=-4\\x=-2\\\therefore (-2,-2)

The solution is {-2,-2}

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The problem tells us that 75 is 3 cents less than three times the old cost. So, if x is the old cost, we can work out the equation based on that.
It says that it's 3 cents less than 3 times x. The question is basically the equation in word form.

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x = 26

20 years ago, a 75-cent pack of gum cost 26 cents.
Hope that helped! =)
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