Question

If 3x + 4y = 5 and -x + by = 10 are parallel, then the value of b = plzz urgent

Answer 1

Answer:

Your answer is 8

Step-by-step explanation:

For an equation to be parallel, A1/A2 = B1/B2= C1/C2....

Therefore,

3/-x=4/b=5/10....

From this...

4/b =5/10...

b=4×10/5= 8...

Ans..b=8

Answer 2

Answer:

b = - 4/3

Step-by-step explanation:

The slopes of parallel lines are equal and y-intercept are different.

Let re-write given equations in slope-intercept form.

3x + 4y = 5

4y = - 3x + 5

y = - $\frac{3}{4}$ x + $\frac{5}{4}$ .... (1)

- x + by = 10

by = x + 10

y = $\frac{1}{b}$ x + $\frac{10}{b}$ ..... (2)

$\frac{1}{b}$ = - $\frac{3}{4}$ ⇒ 3b = - 4 ⇒ b = - 4/3

$\frac{10}{b}$ ≠ $\frac{3}{4}$ ⇒ 3b ≠ 40