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salantis [7]
3 years ago
7

Solve the following simultaneous equations 2x+5y=0 and 3x-4y=23

Mathematics
1 answer:
Elodia [21]3 years ago
7 0

Answer:

x = 5, y = -2

Step-by-step explanation:

2x + 5y = 0 --- Equation 1

Equation 1×3: <u>6x</u> + 15y = 0 --- Equation 2

3x - 4y = 23 --- Equation 3

Equation 3×2: <u>6x</u> - 8y = 46 --- Equation 3

<em>We will be eliminating 6x from Equation 2. </em>

Equation 3-2: 6x - 8y - 6x - 15y = 46-0

-23y = 46

y = 46 ÷ -23

<u>y = -2 </u>

Substitute y = -2 into Equation 1:

2x + 5y = 0

2x + 5(-2) = 0

2x + (-10) = 0

2x - 10 = 0

2x = 10

x = 10 ÷ 2

<u>x = 5 </u>

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