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MakcuM [25]
3 years ago
6

How do you do it.. I don't understand this

Mathematics
1 answer:
MArishka [77]3 years ago
3 0
First calculate x.
since its an isosceles triangle, and the 2 isosceles sides r same so the base angles are the same
therefore 7x + 5 = 9x - 13
5 + 13 = 9x - 7x
2x = 18
x = 9
so when we have x = 9, just use the angle sum of triangle to calculate y.
4y + 7x9 + 5 + 9x9 -13 = 180
4y + 136 = 180
y= 11
so there u have it, x is 9 ans y is 11
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One way you can do this is set the equation equal to each other. This is because you want to know at what x-value has the same y-value. So we get:

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