Question

X=5y: 2x+5y=60

A) 10,4
B) 15,4
C) 20,4
D) 25,4

Answer 1

A

Explanation:

2x+5y=60

replace the x with 5y

2(5y)+5y=60

10y+5y=60

15y=60

divide both sides by 15

y=4

2x+5y=60

replace the y with 4

2x+5(4)=60

2x+20=60

subtract 20 from both sides

2x=40

divide both sides by 2

x=10

Answer 2

C) 20, 4

Explanation:

X = 5y

2x + 5y = 60

substitute in 5y for x: 2(5y) + 5y = 60

10y + 5y = 60

15y = 60

y = 4

x = 5y

x = 5(4) = 20