Question

9x+4y=17a. (2,-1) value of a​

Answer 1

Answer:

[1] 9x - 4y = 7

[2] x - 4y = -17

Graphic Representation of the Equations :

-4y + 9x = 7 -4y + x = -17

Solve by Substitution :

// Solve equation [2] for the variable x

[2] x = 4y - 17

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

[1] 9•(4y-17) - 4y = 7

[1] 32y = 160

// Solve equation [1] for the variable y

[1] 32y = 160

[1] y = 5

// By now we know this much :

x = 4y-17

y = 5

// Use the y value to solve for x

x = 4(5)-17 = 3