
The expression you would substitute for x is -2y+4. The answer is d.
Answer: Solution:
and
.
Step-by-step explanation:
The given pair of equations:

Eliminate equation (i) from (ii) , we get

Put value of b in (ii) , we get

Solution:
and
.
Answer:
x= 1/20
Step-by-step explanation:
-1/2x = -10
multiply by 2x on each side
2x(-1/2x) = -10*2x
-1 = -20x
divide by -20
-1/-20 = -20x/-20
1/20 =x