Answer:
The first one is -1/2
the second one is x+2y-27=0
42
Step-by-step explanation:
We know that 10x + 6y = 7, and so
6(10x + 6y) = 6(7) = 42
x =8
-5(x-3)= -25
we apply distributive property
-5*x +5*3 =-25
-5x +15= -25
-5x = -25-15
-5x = -40
x = 40/5