Any line of the form y = mx+c is a straight line which has a slope m and it makes an intercept of C on y axis.
The given line , y= 5x+c has a slope 5 and it intercepts y axis at 4 units anbove the origin.
Slope 5 means the line is inclined x degrees and tanx = 5.
Also we can get the y intercept by putting x =0 in y = 5x+4: y = 5*0+4 =4. Or (0,4) is a point on y =5x+4.
To get a point other than (0,4) 0n y = 5x+4. Let the x coordinate be 1, the y = 5*1+4 = 9. So (1,9) is a point other than (0,b)
Let y = 0, then fron y=5x+4 becomes, 0= 5x+4 , or x = -4/5. So, (4/5,0) is another point on the line. And 4/5 is the X intercept of the line on X axis.
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