Mathematics
Grade10
Easy

Question

Solve the system:
2x - 5y = 5
y = 4

  1. y = 4
  2. (12.2, 2)
  3. (12.5, 2)
  4. no solution

hintHint:

Here we have to solve the system. Given equations are, 2x – 5y=5 and y = 4. Use the basic concept and solve this question by substitution method.

The correct answer is: (12.5, 2)


    Here we have to solve the system.
    Firstly , we are given with equation which is ,
    2x – 5y = 5 ---(1)
    y = 4 --(2)
    Use substitution method,
    Put y = 4 in equation (1) , we have
    2x – 5y = 5
    2x – 5 x 4 = 5
    2x – 20 = 5
    2x = 5 + 20
    2x = 25
    x = 12.5
    Therefore, x = 12.5 and y = 4.
    The correct answer is ( 12.5 , 4).

    In this question, we have already given the value of y. Using substitution, method we are easily to solve this particular problem.

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