this is one of the last few and i don’t know how to do it

Option 3:

elimination using multiplication (3,-1)

Step-by-step explanation:

The system of equations to be solved are

-5x+3y=-18.......eqn (1)

2x+2y=4. .......eqn (2)

We first multiply eqn(1) by 2 and eqn(2) by 5 to get eqn(3) and eqn(4) respectively.

This implies

-10x+6y=-36.......eqn (3)

10x+10y= 20.......eqn (4)

we then add eqn(3) and eqn(4) to obtain

16y=-16

We divide through by 16

Putting the value of y into eqn(2)

Adding 2to both sides

Dividing through by 2

Hence, (x, y)=(3,-1)

since proposition states that a number is greater than 25, if is true then the number must actually be greater than 25.

this implies that all possible options, except 24, can be accepted

you never say the total so we cant find the percentage used for petrol

step-by-step explanation: