Answer:
A. ( -5.3 , -2.5)
Step-by-step explanation:
Given
x + y = - 7.8 ..........equation 1
y = 2x + 8.1 ............equation 2
Putting equation 2 in equation 1
x + 2x + 8.1 = - 7.8
3x = - 7.8 - 8.1
3x = - 15.9
x = -15.9 / 3
x = -5.3
Now
y = 2 * (-5.3) + 8.1
= - 10.6 + 8.1
= -2.5
