QuestionAugust 26, 2025

Solve by substitution: x=3y+4 3x-5y=8 Type your answer as an ordered pair (x,y) - no spaces square

Solve by substitution: x=3y+4 3x-5y=8 Type your answer as an ordered pair (x,y) - no spaces square
Solve by substitution:
x=3y+4
3x-5y=8
Type your answer as an ordered pair (x,y) - no spaces
square

Solution
4.6(360 votes)

Answer

(1,-1) Explanation 1. Substitute x in the second equation Replace x with 3y + 4 in 3x - 5y = 8: 3(3y + 4) - 5y = 8 2. Simplify the equation Expand and simplify: 9y + 12 - 5y = 8 \rightarrow 4y + 12 = 8 3. Solve for y Subtract 12 from both sides: 4y = -4 \rightarrow y = -1 4. Solve for x Substitute y = -1 into x = 3y + 4: x = 3(-1) + 4 = 1

Explanation

1. Substitute $x$ in the second equation<br /> Replace $x$ with $3y + 4$ in $3x - 5y = 8$: $3(3y + 4) - 5y = 8$<br />2. Simplify the equation<br /> Expand and simplify: $9y + 12 - 5y = 8 \rightarrow 4y + 12 = 8$<br />3. Solve for $y$<br /> Subtract 12 from both sides: $4y = -4 \rightarrow y = -1$<br />4. Solve for $x$<br /> Substitute $y = -1$ into $x = 3y + 4$: $x = 3(-1) + 4 = 1$
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