Question

12. If 3x + 4y = -1 and x - 2y = 3, then y=

a) 1
b) 2
c)-1
d) 3
e) 4

13. If 2x - 4y = 8 and y=2x + 1, then x
a) 2 b) 4
c) -3
d) 3
e) -2

Answer 1

y=3 and x= 5

Explanation:

• 3×+×=-1 and 4y-2y=3
• 4×=1 and 2y=3
• ×=4-1 and y=3+2
• x=3 and y=5