Question

A) 1:100
B) 10:1
4) If3x5y =10 and 5x+3y=14, then what is the value of x + y = ?
A) 2
B) 24
C) 3
D) 9
(4M)​

Answer 1

Answer:

b is a right answer ok bro

Answer 2

Step-by-step explanation:

Given

3x +5y =10 _____(i)

5x+3y =14 _____(ii)

To find ,

x+y = ?

By substitution method

from equation (i)

$3x + 5y = 10$

$x = \frac{10 - 5y}{3}$

This value of x put in equation (ii) we get

$5x + 3y = 14$

$5( \frac{10 - 5y}{3} ) + 3y = 14$

$( \frac{50 - 25y}{3} ) + 3y = 14$

Multiple by 3 both sides we have

$50 - 25y + 9y = 42$

$- 16y = 42 - 50$

$- 16y = - 8$

$y = \frac{ - 8}{ - 16}$

$y = \frac{1}{2}$

Value of y put in equation (3) we get

$x = \frac{10 - 5y}{3}$

$x = \frac{10 - 5 \times 1}{3 \times 2}$

$x = \frac{5}{6}$

then

$x + y =$

$\frac{5}{6} + \frac{1}{2}$

$\frac{5 + 3}{6}$

$\frac{8}{6}$

$\frac{4}{3}$