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6x+8y=30 y=.5x A: 6, -.75 B: 3, 1.5 C: 1, 3 D: 6, 3 Please explain I don't understand substitution.
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6x+8y=30

y=.5x

A: 6, -.75
B: 3, 1.5
C: 1, 3
D: 6, 3

Please explain I don't understand substitution.

User Palo Mraz
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1 Answer

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first substitute .5x in for y to get a solvable equation. You should get 6x+8(.5x)=30. Then multiply 8 times .5 to get 6x+4x=30. Then combine like terms (6x+4x) to get 10x=30 and divide both sides by 10 to get x=3. Then plug this x value (3) into the other equation (y=.5x) to find the value of y. Y=.5(3) so y=1.5. Therefore the answer is B.

User Tristin
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