What is 2x+y=7 3x-y=13

2x+y=7 y−intercept= 7/1= 7.00000

"y=mx+b" is the formula of a straight line drawn on Cartesian coordinate system in which "y" is the vertical axis and "x" the horizontal axis.

In this formula :

y tells us how far up the line goes

x tells us how far along

m is the Slope or Gradient i.e. how steep the line is

b is the Y-intercept i.e. where the line crosses the Y axis

The X and Y intercepts and the Slope are called the line properties. We shall now graph the line  2x+y-7  = 0 and calculate its properties

3x-y=13=   x-intercept = 13/3 = 4.33333

 y-intercept = 13/-1 = -13.00000

Notice that when x = 0 the value of y is 13/-1 so this line "cuts" the y axis at y=-13.00000

 y-intercept = 13/-1  = -13.00000

Slope is defined as the change in y divided by the change in x. We note that for x=0, the value of y is -13.000 and for x=2.000, the value of y is -7.000. So, for a change of 2.000 in x (The change in x is sometimes referred to as "RUN") we get a change of -7.000 - (-13.000) = 6.000 in y. (The change in y is sometimes referred to as "RISE" and the Slope is m = RISE / RUN)

    Slope     = 3

I'M NOT TRYNA PUT TOO MUCH AND MAKE YOUR HEAD HURT SO I'MA PASS ON THE TUTORIALS FOR TODAY

Step-by-step explanation:

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

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