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Zarrin [17]
3 years ago
5

9 – 3 (2+6)÷6 -2 × 5? step by step please

Mathematics
1 answer:
RoseWind [281]3 years ago
5 0
9-3(2+6)/6-2x5

9-3x8/6-2x5

9-3x8/6-10

9-4-10

the answer is -5
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Step-by-step explanation:

Given equations are:

3x+4y=30\ \ \ Eqn\ 1\\3x-y=15\ \ \ \ Eqn\ 2

There are three methods to solve simultaneous equations

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We will use the elimination method as the coefficients of x in both equations are already same

Subtracting equation 2 from equation 1

3x+4y - (3x-y) = 30-15\\3x+4y-3x+y = 15\\5y = 15\\\frac{5y}{5} = \frac{15}{5}\\y = 3

Putting y = 3 in equation 2

3x-3 = 15\\3x = 15+3\\3x = 18\\\frac{3x}{3} = \frac{18}{3}\\x =  6

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The solution for given system of equations is: x = 6 and y = 3

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