Answer:
-4
Step-by-step explanation:
3 + - 7
When you these signs together, + and -, or - and +, whatever order it is it remains the same
+ and - always becomes negative
Here you have 3 + - 7
The +- becomes negative (-)
You end up with 3 - 7, or -7 + 3, as the 3 is positive
-7 + 3 = -4
The model is is I think 25 mentally
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Answer: perpendicular lines intercept, parallel lines never touch and line up in the same direction
Step-by-step explanation:
Answer:
sandwiches is £1.8
bottle water = £1.2
Step-by-step explanation:
Given data
let cheese sandwiches be x
and bottle water be y
3x+2y= 7.8------------1
5x+4y= 14.20---------2
solve 1 and 2
3x+2y= 7.8------------1*5
5x+4y= 14.20---------2*3
15x+10y= 39
- 15x+12y= 42.6
-2y = -3.6
y= 3.6/2
x=1.8
Put x= 1.8 in 1
3(1.8)+2y= 7.8
5.4+2y= 7.8
2y= 7.8-5.4
2y=2.4
y= 2.4/2
y= 1/2
Hence cheese sandwiches is £1.8
bottle water = £1.2
