How do you factor an expression?
for example: 49x + 14

Use the undistributive property
ab+ac=a(b+c)

so find factors and find 'a'
49x=7 times 7 times x
14=2 times 7
the common one is 7
a=7
7(7x)+7(2)=7(7x+2)

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for