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Gelneren [198K]
3 years ago
12

PLEASE HELPP MEE!!!! MATH!!! PLEASEEE HELP ME!!!!!

Mathematics
1 answer:
IRISSAK [1]3 years ago
5 0

Answer:

The solution is (3,2)

Step-by-step explanation:

x - y = 1 →equation 1

-x + 3y = 3 →equation 2

by elimination method,

x - y = 1

-x + 3y = 3

-----------------

0 + 2y = 4

2y = 4

y = 4/2

y = 2

substitute y=2 in equation 1

x - y = 1

x - 2 = 1

x = 1 + 2

x = 3  

∴(3,2) is the solution

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Find the area of a triangle with a =33, b =51, and c =42.
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Answer:

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Step-by-step explanation:

1. You can use the Heron's formula to calculate the area of the triangle, which is:

K=\sqrt{s(s-a)(s-b)(s-c)}

Where:

s=\frac{a+b+c}{2}

2. Calculate s:

s=\frac{33+51+42}{2}\\s=63

3. Substitute values into the formula shown above and calculate the area, as following:

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4. Therefore, the area is 690.1 units².

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3 years ago
A sample of lake water contains 150grams of salt. If 30% of the water sample is salt, find the number of grams the entire sample
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Answer:

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Hope this helps!

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