Question

Solve x=28-3y and x+7y=64

Answer 1

// Solve equation [2] for the variable x

[2] x = -7y + 64

// Plug this in for variable x in equation [1]

[1] (-7y+64) + 3y = 28

[1] - 4y = -36

// Solve equation [1] for the variable y

[1] 4y = 36

[1] y = 9

// By now we know this much :

x = -7y+64

y = 9

// Use the y value to solve for x

x = -7(9)+64 = 1

{x,y} = {1,9}

Answer 2

Answer:

y = 9 , x = 1

Step-by-step explanation:

x+3y = 28--------1

x+7y = 64--------2

subtract 2nd equa - 1st equa

= 7y-3y=64-28

4y = 36

y = 9

and x = 1