Question

Solve the system using the substitution method.

y=4
x+y=7
Demonstrate how you substituted to write an equation in one variable.

Answer 1

since y=4, we can substitute that value into the second equation. now x+y=7 becomes x+4=7. when we subtract three from both sides, we get that x=3. the ordered pair is (3,4)

Answer 2

x=3

Explanation:

x+4=7

x=7-4

x=3