Question

7x + 8y = 4 3x + 2y = 6

Answer 1

Answer:

x=4

y=-3

Step-by-step explanation:

use substitution method :

1)

7x + 8y = 4 ... (1)

3x + 2y = 6 ... (2)

2) Create the third equation by using

equation (2)

3x + 2y = 6

3x = 6-2y

x = 6-2y/3 ..... (3)

3) Substitute (3) into (1)

7(6-2y)/3 + 8y = 4

4) Solve the equation

42 - 14y /3 + 8y = 4

42 -14y+24y = 12

10y = 12-42

y = -3

5) Find value of x

x = 6-2y/3

= 6 -2(-3)/3

= 12/3

= 4