Ch.5 Straight line graphs Flashcards
1
Q
what are the 2 equations of a straight line?
A
y = mx + c
or
ax + by + c = 0
2
Q
how can the equation of a line with gradient m be worked out if it passes (x1, y1)?
A
y - y1 = m( x - x1)
3
Q
how would you find out the midpoint of a line?
A
add up 2 x-coordinates then divide by 2 and repeat for the y-coordinates
4
Q
how would you find the length of a line segment / distance between 2 points?
A
Square root of (x2 - x1) ² + ( y2 - y1 ) ²
5
Q
how could you algebraically find the point of intersection of two lines?
A
using simultaneous equations
