Question

Hi smart people of math :p can someone help me with this question

Answer 1

Answer:

Step-by-step explanation: so you multiply the second equation by 5 so it will be 15x+40y=75

Then you minus the equation so it will give u -41y=-53 and then you will divide by -41 so y will be 1.29 and x will be 1.55

Answer 2

Answer:

d

Step-by-step explanation:

15x-y=22---(1)

3x+8y---(2)

(1)-(2)x3: -41y=-53

i.e. y=1.2927 (correct to 5 significant figures)

Put y=1.2927 into (1),

3x+8(1.2927)=15

x=1.5528

Therefore, the answer is (1.55, 1.29) (rounded to the nearest hundredth)

*You can substitute the answer back to the equations

e.g. option a is (0.45, 2.47) so you can put x=0.45 and y=2.47 into 15x-y and you will find that the answer is not 22