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Solve the system 4x+2y=7 y=5x A. (1,5) B. (3,15) C. (2,10) D. (0.5,2.5)

Solve the system 4x+2y=7 y=5x A. (1,5) B. (3,15) C. (2,10) D. (0.5,2.5)
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4 votes
Solve the system

4x+2y=7 y=5x
A. (1,5)
B. (3,15)
C. (2,10)
D. (0.5,2.5)

User Wuliang
by
7.9k points

2 Answers

4 votes
Just do a direct substitution.

Replace 'y' with '5x'

4x + 2(5x) = 7

4x + 10x = 7

14x = 7

x = 7/14 = 1/2

Sub into y=5x to find 'y'

y = 5(1/2) = 5/2 = 2.5

Answer:
x = 0.5, y = 2.5
User Piddien
by
8.1k points
5 votes
Attached a solution and showed work.
Solve the system 4x+2y=7 y=5x A. (1,5) B. (3,15) C. (2,10) D. (0.5,2.5)-example-1
User ACarter
by
8.7k points
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