y=-0.70x^2 +30--(1)
y=7--(2)
substitude (1) to (2), 7=-0.70x^2 +30
0.70x^2= 23
x10, 7x^2=230
x^2= 230/7
x= square root of 230/7
Ans :- y = -0.70x^2 + 30
y + 0.70x^2 - 30 = 0
0.70x^2 + y - 30 = 0
0.70x^2 + 7 - 30 = 0
0.70x^2 - 23 = 0
0.70x^2 = 23
x^2 = 23/7*10
x^2 = 230/7
x = sqrt 230/7
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