Answer:
x−y=−2
4x−y=4
To solve a pair of equations using substitution, first solve one of the equations for one of the variables. Then substitute the result for that variable in the other equation.
x−y=−2,4x−y=4
Choose one of the equations and solve it for x by isolating x on the left hand side of the equal sign.
x−y=−2
Add y to both sides of the equation.
x=y−2
Substitute y−2 for x in the other equation, 4x−y=4.
4(y−2)−y=4
Multiply 4 times y−2.
4y−8−y=4
Add 4y to −y.
3y−8=4
Add 8 to both sides of the equation.
3y=12
Divide both sides by 3.
y=4
Substitute 4 for y in x=y−2. Because the resulting equation contains only one variable, you can solve for x directly.
x=4−2
Add −2 to 4.
x=2
The system is now solved