Remark
No matter what kind of triangle it is, the angles must add up to 180, just as you said.
Suppose we say
A = 6x - 9
B = 9x + 1
C = y We need an expression for C or y.
A + B + C = 180
6x - 9 + 9x + 1 + y = 180 Collect the like terms on the left.
6x + 9x + 1 - 9 + y = 180
15x - 8 + y = 180 Add 8 to both sides.
15x + y = 180 + 8
15x + y = 188 Subtract 15x from both sides.
y = 188 - 15x <<<<<<<<< Answer
Answer:
(3,2)
Step-by-step explanation:
when reflecting across the x axis the y value becomes - while the x value stays the same
Answer: A, B, and D
<u>Step-by-step explanation:</u>
Input the coordinates into the inequality to see which makes a true statement:
5x - 2y < 8
A) x = -1, y = 1 5(-1) - 2(1) < 8
-5 - 2 < 8
-7 < 8 TRUE!
B) x = -3, y = 4 5(-3) - 2(4) < 8
-15 - 8 < 8
-23 < 8 TRUE!
C) x = 4, y = 0 5(4) - 2(0) < 8
20 - 0 < 8
20 < 8 False
D) x = -2, y = 3 5(-2) - 2(3) < 8
-10 - 6 < 8
-16 < 8 TRUE!
Answer:
y = 21, x = 6
Step-by-step explanation:
Substitute y = 7x - 21
7x - 21 = x + 15
Isolate x for 7x - 21 = x +15
x = 6
For y = 7x - 21
Substitute x = 6
y = 7 * 6 - 21
Simplify
y = 21
Answer:
hey
Step-by-step explanation: