Answer:
x=10.5
Step-by-step explanation:
To solve, cross multiply
7/6=x/9
6*x=7*9
6x=63
Divide by 6 on both sides
x=10.5
Another way to solve is to multiply both sides by 9
7/6=x/9
9*7/6=x/9*9
10.5=x
Hope this helps! :)
Answer:
1. f(x) = 3x + 7
2. 
3. f(x) = x + 5
4. f(x) = -2x - 5
5. 
Step-by-step explanation:
Rearrange all the equations to make y the subject,
then substitute f(x) for y:
1. y - 3x = 7
Add 3x to both sides:
⇒ y = 3x + 7
⇒ f(x) = 3x + 7
2. 2x + 4y = 8
Subtract 2x from both sides:
⇒ 4y = -2x + 8
Divide both sides by 4:
⇒ 
⇒ 
3. -x + y = 5
Add x to both sides:
⇒ y = x + 5
⇒ f(x) = x + 5
4. y + 5 = -2x
Subtract 5 from both sides:
⇒ y = -2x - 5
⇒ f(x) = -2x - 5
5. 3x + 2y - 4 = 0
Subtract 3x from both sides:
⇒ 2y - 4 = -3x
Add 4 to both sides:
⇒ 2y = -3x + 4
Divide both sides by 2;
⇒ 
⇒ 
The answer is 44.3 I know because that 9 goes ^