In this section we consider solving linear equations, using both algebra and graphs.
Solve the following equations:
(a)  x + 6 = 13 
 

(b)  x – 7 = 11 
 
(c)  4x = 72 
 
(d) 


Solve the following equations:
(a)  2x + 4 = 20 
 

(b) 

 
(c)  4(x + 4) = 18 

Solve the following equations:
(a)  4x + 2 = 3x + 5 
 

(b)  4x – 4 = 10 – 3x 

Use graphs to solve the following equations:
Draw the lines y = 4x – 7 and y = 9.
The solution is given by the value on the xaxis immediately below the point where y = 4x – 7 and y = 9 cross. The solution is x = 4. 
Draw the lines y = x + 7 and y = 3x – 3.
The lines cross where x = 5, so this is the solution of the equation. 