Systems of equations.
y= -3x+1
y=x-3 how do i start it

What is the value of 1/3x + 7x when x = 5

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.

Determine the area of a triangle with (see picture below)