A few days ago
Tab C

Need help with geometry homework!?

I was doing my homework and was doing fine until I reached the mixed review. I’ll give you two of my problems (there are 8) and hopefully you can help me. Please list a source if you can.

Directions: You are given an equation of a line and a point. Use substitution to determine whether the point is on the line.

Problem 18~

y=5x+3; A(1,8)

Problem 19~

y= -3x -6; A(2,0)

Top 3 Answers
A few days ago
K

Favorite Answer

Ok. First look at the first problem: y=5x+3; A(1,8). You are given an equation with x and y and then you are given a point (1,8). Looking at the point, what is x? The x is 1. What is y? The y is 8. Now plug those values into the equation to see if they match.

y=5x+3; A(1,8)

8=5(1)+3

8=5+3

8=8

So that matches. So that point is on the line.

Now look at the next one.

y= -3x -6; A(2,0)

You are given an equation with x and y in it, and a point (2,0). What is the x value? 2. What is the y value? 0. Plug those into the equation.

y= -3x -6; A(2,0)

0=-3(2)-6

0=-6-6

0=-12. NO!!

So this point isn’t on the line.

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A few days ago
dpirsq2
So substitute. Remember the coordinates are (x,y) and you replace the value for the variable.

18) 8 = 5(1) + 3

8 = 8 yes

19) 0 = -3(2) – 6

0 = -6 -6 no

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A few days ago
Anand S
A line is made up of all the points that satisfy its equation.

Your test point is (x, y), so plug the test point’s x-value in for the x in the line equation and plug the test point’s y-value in for the y in the line equation.

If the equation is true, the point is on the line. If the equation is false, the point is not on the line.

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