I. Directions: Evaluate the following algebraic expressions using the following value for x= 1 y = 2 ; a = -1 and b = -2 (10pts) 1. 3x – 2 2. -X2 + 2 3. xy +1 4. -4x + y - 9 5. y - x + 21 6. 2ab + 3 7. 3a - b 8. a? - 2b + 1 9. x + 2y - a + 2b - 3 10. 4ab² - xy ху
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Step-by-step explanation:
1) 3x−2
Evaluate for x=1
(3)(1)−2
=1
2)−x2+2
Evaluate for x=1
−12+2
=1
3)xy+1
Evaluate for x=1,y=2
(1)(2)+1
=3
4)−4x+y−9
Evaluate for x=1,y=2
(−4)(1)+2−9
= −11
5)y−x+21
Evaluate for x=1,y=2
2−1+21
=22
6)2ab+3
Evaluate for a=−1,b=−2
(2)(−1)(−2)+3
=7
7)3a−b
Evaluate for a=−1,b=−2
(3)(−1)−(−2)
= −1
8)a2−2b+1
Evaluate for a=−1,b=−2
(−1)2−(2)(−2)+1
=6
9)x+2y−a+2b−3
Evaluate for a=−1,b=−2,x=1,y=2
1+(2)(2)−(−1)+(2)(−2)−3
= −1
10)4ab2−xy
Evaluate for a=−1,b=−2,x=1,y=2
(4)(−1)(−2)2−(1)(2)
= −18