1 A tree is 6 metres high. It grows 0.5 metres each year
Draw a graph of the formula.

Your graph starts at (0, 6), because after 0 years (i.e. at the beginning) the tree is 6 meters high.

The next point would be (1, 6.5), because after one years the tree has grown half a meter, thus becoming 6.5 meters high.

Next, you have (2, 7): one more year passed, 0.5 meters gained in height.

You'll notice that the points align along a straight line. Prolong the line and you'll have the graph of the function

5x+2x=49

7x=49

x=7. 35 apples

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