Question

Solving systems of equations using substitution

Answer 1

y = 3 - x. this is equation 1
8x + y = -4. this is equation 2
since equation 1 already defined the value of y in terms of x, we can substitute it into 2
8x + 3 - x = -4
7x = -7
x = -1
as x = -1, substitute it back into equation 1,
y = 3 - (-1)
y = 3 +1
y = 4