I'm here to help. Those 3 points all lie on the same line. We know this because if we find the slope between any 2 of those points, it is the same. I'll show you: 
. Now another 2 points: 
. The same holds for the first and third points. So we got that out of the way. Now we will pick any one of those points and use the x and y values and our slope to write an equation of that line and then finally solve for the x and y intercepts. I'm going to use the first point (10, 20): 
. We will simplify to get it into y = mx + b form: 
and 
and finally, 
. The y-intercept exists when x = 0, so when x = 0, y = 36. The x-intercept exists when y = 0, so when y = 0, x = 22.5. In summary, y-intercept: (0, 36). x-intercept: (22.5, 0) and you're all done!
21.
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The area is 38
and to find this you need to use the formula length times width so 10*3.8 which equals 38.
The value of x is 5
<em><u>Solution: </u></em>
<em><u> The slope of a line is given by formula: </u></em>
From given,
<em><u>Substituting the values we ge</u></em><em><u>t,</u></em>
Thus the value of x is 5