y = mx + b slope(m) = 80 use either of ur points (5,465)...x = 5 and y = 465 now we sub and find b, the y int 465 = 80(5) + b 465 = 400 + b 465 - 400 = b 65 = b
equation is : y = 80x + 65...but we need it in standard form y = 80x + 65 -80x + y = 65...multiply by -1 to make x positive 80x - y = -65 <== standard form ======================== function notation.....f(x) is the same as y
so y = 80x + 65 in function notation becomes f(x) = 80x + 65 ======================= x axis will be days rented y axis will be total cost
to graph : y = 80x + 65.....the slope here is 80...the y int is (0,65)
to find the x int, sub in 0 for y and solve for x 0 = 80x + 65 -80x = 65 x = - 65/80 = - 13/16....so ur x int is (-13/16,0)
and if u need to find more points on ur line.... 80x - y = -65....sub in any number for x, and solve for y
If you know the base and area of the triangle, you can divide the base by 2, then divide that by the area to find the height. To find the height of an equilateral triangle, use the Pythagorean Theorem, a^2 + b^2 = c^2.
