answer:
To solve the system of equations using substitution, we substitute the given value of y into the first equation and solve for x.
1. Given equations:
-10x - 10y = -20
y = -8
2. Substitute y = -8 into the first equation:
-10x - 10(-8) = -20
3. Simplify:
-10x + 80 = -20
4. Subtract 80 from both sides of the equation:
-10x = -20 - 80
-10x = -100
5. Divide both sides by -10 to solve for x:
x = -100 / -10
x = 10
6. Therefore, the solution to the system of equations is x = 10 and y = -8.
the silly !!!