Question

I need confirmation to this. I did it already. I just want to know if I’m right. Please work it out for me to see.

Answer 1

(a)

4x + 3y = 23

5x + 2y = 20

(b)

4x + 3y = 23 ⇒ -2(4x + 3y = 23) ⇒ -8x - 6y = -46

5x + 2y = 20 ⇒ 3(5x + 2y = 20) ⇒ 15x + 6y = 60

7x = 14

x = 2

5x + 2y = 20

5(2) + 2y = 20

10 + 2y = 20

2y = 10

y = 5

Answer: biscuit = $2, ice cream = $5