Question

Work out the value of each expression if x=4 and y=6
i 3x+9 ii 4x-y

Answer 1

i) 21 and ii) 6

Explanation:

i) If X=4 and Y=6, then:

3X+9, replacing X

3(4) + 9

12 + 9

21

ii) 4X-Y

4(3) - 6

12 - 6

6