Question

1. substitute these values into each expression; a = 5, b = 2

a. a + b
b. a - b
c. 2a + 3b
d. 5a - b

Explanation:

Step1: Substitute a=5, b=2

Part a:

Substitute into $a+b$
$5 + 2$

Part b:

Substitute into $a-b$
$5 - 2$

Part c:

Substitute into $2a+3b$
$2\times5 + 3\times2$

Part d:

Substitute into $5a-b$
$5\times5 - 2$

Step2: Calculate each expression

Part a:

Simplify the sum
$5+2=7$

Part b:

Simplify the difference
$5-2=3$

Part c:

Compute products then sum
$10 + 6=16$

Part d:

Compute product then subtract
$25 - 2=23$

Answer:

a. 7
b. 3
c. 16
d. 23