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Vinil7 [7]
2 years ago
5

SUBSTITUTION METHOD 8x+4y=15 x+y=3

Mathematics
2 answers:
ehidna [41]2 years ago
7 0

Answer:

x = 3/4 and 9/4

Step-by-step explanation:

Rewrite equations:

x+y=3;8x+4y=15

Step: Solvex+y=3for x:

x+y=3

x+y+−y=3+−y(Add -y to both sides)

x=−y+3

Step: Substitute−y+3forxin8x+4y=15:

8x+4y=15

8(−y+3)+4y=15

−4y+24=15(Simplify both sides of the equation)

−4y+24+−24=15+−24(Add -24 to both sides)

−4y=−9

\frac{-4y}{-4} =\frac{-9}{-4}

Step: Substitute \frac{9}{4} for y in x=−y+3:

x=−y+3

x = - \frac{9}{4} +3

x=\frac{3}{4} (Simplify both sides of the equation)

Answer:

x=\frac{3}{4} and y=\frac{9}{4}

zvonat [6]2 years ago
3 0

Answer:

(2.25, 0.75)

Step-by-step explanation:

x+y=3

subract x from both sides

y=x-3

subsitute y

8x+4(x-3)=15

distribute

8x+4x-12=15

combine like terms

12x-12=15

12x=27

divide

<u>x=9/4 or 2.25</u>

Substitute in one equation

2.25+y=3

<u>y=0.75 or 3/4</u>

Don't forget to check your work!

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