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nekit [7.7K]
3 years ago
7

If 0.9x-1.3=-3.1, what is the value of x-0.8?

Mathematics
2 answers:
Butoxors [25]3 years ago
3 0
−<span>2.8
</span>Okay so "0.9x-1.3=-3.1" x=-2
 
<span><span><span>0.9x</span>−1.3</span>=<span>−3.1

</span></span>add 1.3 to both sides

<span><span><span><span>0.9x</span>−1.3</span>+1.3</span>=<span><span>−3.1</span>+1.3

</span></span><span><span>0.9x</span>=<span>−1.8

</span></span>divide both sides by 0.9

<span><span><span>0.9x/</span>0.9</span>=<span><span>−1.8/</span><span>0.9

</span></span></span>x=<span>−2</span>

So if you plug in -2 into "x-0.8" you get −2.8

<span>=<span><span>−2</span>−0.8

</span></span><span>=<span><span>−2-</span><span>0.8

</span></span></span><span>=<span>−2.8

</span></span>Hope this helps. 
Georgia [21]3 years ago
3 0
Your answer is -2.8.
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Part a

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Part b

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Rumble's cost: C = 2 + S

Pedal's cost: C = 4 + 0.6S

4 + 0.6S < 2 + S

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For example graph shows S = 2.5, but we know that's not possible

d) No, since the cost is 2 + S,

cost can't be in decimals either.

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Using multiplication property of equality

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Subtracting 145 from both sides leaves you with x = 35, which gives you C.

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