Answer:
sorry i didn't find the value of x, but i did find the value of y. if that helps.
Explanation:
y=a+5
x = 19
The sum of both angles will be equal to a supplementary angle. A supplementary angle is when two angles add up to be 180°. Write an equation and solve for x.
3x + 5 + 7x - 15 = 180
~Combine like terms
10x - 10 = 180
~Add 10 to both sides
10x = 190
~Divide 10 to both sides
Best of Luck!
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