Question

0.5x² - 0.6xy -0.14x2 +0.25y?
1.2x +0.7y -0.6x - 1.2y​

Answer 1

Solve equation [1] for the variable y

[1] y = 2x - 7

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

[2] 4x + 3•(2x-7) = 9

[2] 10x = 30

// Solve equation [2] for the variable x

[2] 10x = 30

[2] x = 3

// By now we know this much :

x = 3

y = 2x-7

// Use the x value to solve for y