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Answer18:

The quadrilateral ABCD is not a parallelogram

Answer19:

The quadrilateral ABCD is a parallelogram

Step-by-step explanation:

For question 18:

Given that vertices of a quadrilateral are A(-4,-1), B(-4,6), C(2,6) and D(2,-4)

The slope of a line is given m=

Now,

The slope of a line AB:

m=

m=

m=

The slope is 90 degree

The slope of a line BC:

m=

m=

m=

The slope is zero degree

The slope of a line CD:

m=

m=

m=

The slope is 90 degree

The slope of a line DA:

m=

m=

m=

m=

The slope of the only line AB and CD are the same.

Thus, The quadrilateral ABCD is not a parallelogram

For question 19:

Given that vertices of a quadrilateral are A(-2,3), B(3,2), C(2,-1) and D(-3,0)

The slope of a line is given m=

Now,

The slope of a line AB:

m=

m=

m=

The slope of a line BC:

m=

m=

m=

m=3

The slope of a line CD:

m=

m=

m=

The slope of a line DA:

m=

m=

m=3

The slope of the line AB and CD are the same

The slope of the line BC and DA are the same

Thus, The quadrilateral ABCD is a parallelogram

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3