3 years ago

Two times one number added to three times a second number is 21.

Mathematics

1 answer:

Daniel [21]3 years ago

3 0

Answer:

Step-by-step explanation:

"Two times one number added to three times a second number is 21.

2x + 3y = 21

"The second number is ten less than five times the first number"

y = 5x-10

Substitution

2x+3(5x-10) = 21

2x + 15x - 30 = 21

17x = 51

x = 3

y = 5x-10 = 5

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Algebraically solve the system of equations shown below. Note that you can use either factoring or the quadratic formula to find

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$6x^2+19x-15=-12x+15\\
6x^2+31x-30=0\\
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