Question

4. p = 2q - 1,q= 5 - 3p
5. 9x + 4y = 5, 4x - 5y = 9
6. x + 3y = 5, 3x - y = 5
7. 3x - 7y + 10 = 0, y - 2x - 3 = 0
8. 20u - 30v = 13, 10v-10u = -5
9. 2x - 3y = 1.3, y - x=0.5
10. 11x + 15y + 23 = 0, 7x - 2y - 20 = 0
11. 3 - (x - 5) = y + 2
2(x + y) = 4 - 3y
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Answer 1

Answer:

5.X=1,Y=1

Step-by-step explanation:

9x+4y=5,4x-5y=9

(9x+4y=5)+(4x-5y=9)

5(9x+4y=5)+4(4x-5y=9)

(45x+20y=25)+(16x-20y=36)

(45x=25)+(16x=36)

(61x=61)

(x=61\61l

=(x=1)...