Question

Find the value of x for which y =20 is a solution of the equation 5x+20y=500

Answer 1

HI there !!

x = ?

y = 20

5x + 20 y = 500


5x + 20 × 20 = 500

5x + 400 = 500

5x = 500 - 400

5x = 100

x = 100/5

x = 20

Answer 2

it is given,
 y = 20  -----1
substitute 1 in the equation,

5x + 20 (20) = 500
5x = 500 - 400
5x = 100
x=100/5
x=20

thus the value of x is also 20.

hope it helps!!