Question

solve by substitution
x + 3y = -4
4x + 5y = 5

Answer 1

what would you like to substitute?

Answer 2

x + 3y = -4 ....................(1)
4x + 5y = 5.....................(2)

from equation (1) x= -4-3y
substitute for x in (2)
4(-4-3y) + 5y = 5
-16 - 12y + 5y = 5
-7y = 21
y = 21/-7 = -3
now plug y = -3 into equation (1) to get x

Answer 3

or since we have an equation for x in terms of y; just use that one either-or