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Based on the straight line equation of y = mx + c, where m is the gradient and c is the y-intercept, 3 would be the gradient and 7 would be the y-intercept.

First of all, we put all the unknowns to the same side. 67x and 12x will be on the left hand side; 13 and -5 are on the right hand side. For the unknowns, when 12x moves from right hand side to the left h...

let it be 0.75/1 (every number is a fraction over 1)this can then be written as 75/100, this can then be simplified to 15/20 when both top and bottom are divided by 5. This is not yet the smallest form as...

40 people in total16 = at least a phone, 7 = only a tablet, 13 = both
Must figure out how many people just own a phone: 16 - 13 (both phones and tablet) = 3 (just ow...

To work out who saved the most we will need to compare the amounts they all saved which we can do easily when they're all in the same form. the easiest one to convert to is percentages because all the val...