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Degger [83]
3 years ago
8

PLEASE HELP ME!! 30 points for right answer!

Mathematics
1 answer:
Reptile [31]3 years ago
6 0

Answer:

Given the system of equation:

g +h = 9                        ......[1]

8g + 7.5h = 71               ......[2]

We can write equation [1] as;

g = 9-h        ......[3]

Now, substitute equation [3] in [2] we get;

8(9-h) + 7.5h = 71

Using distributive property i,e a \cdot (b+c) = a\cdot b +a\cdot c.

72 - 8h +7.5h = 71

Combine like terms:

72 - 0.5 h = 71

Subtract 72 to both sides of an equation:

72 - 0.5 h -72 = 71-72

Simplify:

- 0.5 h = -1

Divide both sides by -0.5 we get;

\frac{-0.5h}{-0.5} = \frac{-1}{-0.5}

Simplify:

h = 2

Substitute the value of h =2 in equation [3] to solve for g;

g = 9 - 2 = 7

g = 7

Therefore, the solution for the given equation is :

g = 7 and h = 2

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16 ) GO...

a) 5487 × ( 65 + 35 ) = 5487 × 100 = 548700

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c) 502 × 1,008 = ( 500 + 2 ) ( 1,000 + 8 ) = 500,000 + 4,000 + 2,000 + 16 = 506,016

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