475,301 views
25 votes
25 votes
Which equations represent valid proportions? Check all that apply.

StartFraction 4 over 18 EndFraction = StartFraction 6 over 27 EndFraction
StartFraction 4 over 6 EndFraction = StartFraction 16 over 36 EndFraction
Three-fourths = StartFraction 9 over 12 EndFraction
StartFraction 5 over 9 EndFraction = StartFraction 8 over 12 EndFraction

User Seli
by
2.6k points

2 Answers

18 votes
18 votes

The solution to the given system is (3,8).

Explanation:

To draw a graph system for a linear equation,

Step 1: Consider two x values and draw a line joining the new points.

y = x + 5 ⇒1

y = 2x + 2 ⇒2

For both equations substitute two random values for x.

Let us Consider x=0 and x=10.

For equation 1,

y=x+5. y=x+5

y=0+5. y=10+5

y=5 y=15

The new points for equation 1 are (0,5) and (10,15).

Draw a big straight line passing through these two points.

For equation 2,

y=2x+2. y=2x+2

y=0+2. y=20+2

y=2 y=22.

The new points for equation 1 are (0,2) and (10,22).

Again, draw a big straight line passing through these two points.

Step 2: Mark the intercepting point and that will be the solution for the given system.

For this system, the solution is (3,8).

To check this answer equates both equations,

x+5=2x+2.

2x-x=5-2.

x=3.

Substitute the x value in any of the equations,

y=3+5.

y=8.

User Josh Delsman
by
3.0k points
4 votes
4 votes

Answer:

A and C.

Explanation:

A. 4/18 = 6/27 2/9 = 2/9 (Correct)

B. 4/6 = 16/36 2/3 = 4/9 (Unequal)

C. 3/4 = 9/12 3/4 = 3/4 (Correct)

D. 5/9 = 8/12 5/9 = 2/3 (Unequal)

User JohnO
by
2.1k points