Solve linear equations: mixed review
Key Notes :
Like terms are terms that have the same variables raised to the same powers. To add like terms, add their coefficients.
Learn with an example
Solve for r.
-5r + 20r + -20r = 20
r = ______
Combine the r terms:
-5r + 20r + -20r = 20
-5r = 20
Divide by -5 to solve for r:
-5r / -5 = 20 / -5
r = -4
The answer is -4
Solve for q.
q + 11 / -3 = -1
q = _____
Solve.
q + 11 / -3 = -1
q+11/-3 . -3= –1 · –3 Multiply both sides by –3
q + 11 = 3 Simplify
q + 11 − 11 = 3 − 11 Subtract 11 from both sides
q = –8 Simplify
Solve for u.
2(u + 9) − 1 = 9
u =______
Solve.
2(u + 9) − 1 = 9
2(u + 9) − 1 + 1 = 9 + 1 Add 1 to both sides
2(u + 9) = 10 Simplify
2(u+9)/2=10/2 Divide both sides by 2
u + 9 = 5 Simplify
u + 9 − 9 = 5 − 9 Subtract 9 from both sides
u = –4 Simplify
Let’s practice!
