1A. Find A and B such that (2,-3) is a solution to the following system: A x plus 7 y equals 13 minus 2 x plus B y equals 5 . Explain your reasoning and show all relevant work.

B. Then verify that your values for A and B work by plugging these values into the system, and solving the it using the substitution method or elimination method (your choice). Show all appropriate work.

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Heather is writing a quadratic function that represents a parabola that touches but does not cross the x-axis at x = -6. which function could heather be writing? fx) = x2 + 36x + 12 = x2 - 36x - 12 f(x) = -x + 12x + 36 f(x) = -x? - 12x - 36

If rt is greater than ba, which statement must be true ?