Question 1171000
On the below 4 equations, can you show me the steps either by substitution or addition method to determine the 2 digit graph intersection points on a graph?

Problem 1:

x+2y = 15
x-2y = -9
--------------------- Add
2x = 24
x = 12
Sub for x and find y.
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Problem 2:

x-y = 0
7x-3y = 24
y = x
Sub for either.
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Problem 3:

3x-8y = 10
x-4y = 3
Multiply the 2nd eqn by 2, then subtract.
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Problem 4:

2x+3y = -5
3x-y = 20
Multiply the 2nd eqn by 3 then add.