Question

X + 4y = 7
4x – 3y = 9

Answer 1

274/484884 /378383/3738

Answer 2

{3,1}

Explaination

3 +4=7[1] x = -4y + 7

// Plug this in for variable x in equation [2]

[2] 4•(-4y+7) - 3y = 9

[2] - 19y = -19

// Solve equation [2] for the variable y

[2] 19y = 19

[2] y = 1

// By now we know this much :

x = -4y+7

y = 1

// Use the y value to solve for x

x = -4(1)+7 = 3

Solution :

{x,y} = {3,1}