Mathematics
Grade-8
Easy

Question

x-intercept is twice of y-intercept and the sum of the intercepts is 6. The equation of line will be

  1. 2x + y = 4
  2. x + 2y = 4
  3. x + 4y = 2
  4. 4x + y = 2

hintHint:

Use substitution method to find the values of both the intercepts and then replace their value in the standard equation to obtain the line equation.

The correct answer is: x + 2y = 4


    G i v e n comma
x minus i n t e r c e p t space equals space 2 open parentheses y minus i n t e r c e p t close parentheses
minus greater than space a space equals space 2 b space space..... space 1
x minus i n t e r c e p t space plus space y minus i n t e r c e p t space equals space 6
minus greater than space a space plus space b space equals space 6 space space space space..... space 2

T o space f i n d comma
t h e space e q u a t i o n space o f space t h e space l i n e

R e p l a c i n g space a space w i t h space e q u a r i o n space 1 space i n space e q u a t i o n space 2 comma
2 b space plus space b space equals space 6
3 b space equals space 6
b space equals space open parentheses 6 over 3 close parentheses space equals space 2

R e p l a c i n g space t h e space v a l u e space o f space b space i n space e q u a t i o n space 1 comma
a space equals space 2 b space equals space 2 open parentheses 2 close parentheses space equals space 4

T h e space e q u a t i o n space o f space t h e space l i n e space i s space r e p r e s e n t e d space b y
open parentheses x over a close parentheses space plus space open parentheses y over b close parentheses space equals space 1

R e p l a c i n g space t h e space v a l u e s space o f space a space a n d space b space i n space t h e space a b o v e space e q u a t i o n comma
open parentheses x over 4 close parentheses space plus space open parentheses y over 2 close parentheses space equals space 1
fraction numerator x space plus space 2 y over denominator 4 end fraction space equals space 1
x space plus space 2 y space equals space 4

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