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To solve this system of linear equations (therefore, to find x and y) we can proceed the following:1) we isolate x from the first question, moving -3y on the right hand side of the equation. When we move ...

Substitute y = 2x - 1 into the first equation.

2x + 3(2x -1) = 21

2x + 6x - 3 = 21

8x = 24

x = 3

Therefore y = 2(3) - 1 = 5

think of ways to add up 1.
0.5 x 20.4 and 0.60.3 and 0.70.2 and 0.80.1 and 0.9 then multiply them and you'll find the last one to be correct

Students who study German in Year 12 do not study Maths.

0.14*525 = 73.5Therefore, £73.50 is the answer.